The Cercle was founded in 1998. It is the club house for members coming from the two main language communities of the country.

It is a place for meeting and networking, destined notably for leaders of private and public companies, members of the liberal professions and personalities from the academic and political worlds.

The Cercle offers the members of this multidisciplinary community a means of exchanging ideas through varied activities linking work and leisure in an exceptional environment.

The combination of a high quality restaurant, a summer terrace and a bar allows for all types of get-togethers, ranging from a tête-à-tête to an event with 1,000 guests, as well as events suited to the modular features of the 12 function rooms.  The latter (from 6 to 32 guests around one single table) can be used privately by members and their guests, for a lunch, dinner or breakfast.

Members benefit from many advantages, free of charge, and are regularly invited to different events.

The Cercle appears to be an open space but it is well organised and everything is under control.  Thus, gastronomic dinners, banquets, simple lunches, exceptional events, management seminars or large conferences, can all take place in a homogeneous qualitative context.  Members feel at home at the Cercle and enjoy all the attention needed for efficient meetings

The Team


Isabelle Simon
Executive director

Memberships & Sponsors

Eric Degand


Vincianne Delvigne
Business Development Manager


Hélène Lebailly
Responsible for communication


Nancy van den Berghe
Graphic designer


Magaly Bonsen
Administration and finance


Vanessa d'Hennezel
Evening Events coordinator


Magali Peers de Nieuwburgh


Eyup Devre

Supply office

Emine Devre
Building manager


Ludovic, Pablo, Gilles, Daniel et Richard
Kitchen team


Henry - Céline
Catering team

The Captains

Hugues de Bellefroid
Classic cars Captain

Jean-Michel Detry
Classic cars Captain

Sébastien Gillain
Motorbike captain

Patrick Baar
Bridge Captain

Alain Lenz
Shooting Captain

Frédéric Wauthier
Tennis Captain

Guy Cayron
Sailing Captain

Philippe Mercelis
Golf Captain

Business Tables

Luc Deleuze
Real Estate Captain

Yves Colot
Finance table

Edouard Nouvellon
Finance table

Valérie-Anne de Brauwere
Legal table

Edouard Cambier
Media & innovation table

Board of management

Herman Craeninckx

Charles-Albert Peers de Nieuwburgh

Michel Eeckhout

Virginie Taittinger

Willem Wynaendts

Virtual tour


The Cercle de Lorraine began its activities at Château Fond'Roy, located on Avenue du Prince d'Orange in Uccle, on 23 April 1998. It was established as a non-profit organisation by a group of private partners, and developed its golden reputation with the friendly support of some of the most iconic personalities in the country’s French and Flemish speaking economic and financial communities.
Twelve years later, on August 30 2010, the Cercle was “reborn” when it moved to its new city centre headquarters. The Palace of Princes of Merode...

Palace of the Princes of Merode

Located in the heart of the “City”, the former palace of the Princes of Merode (with a surface area of 2800 m² available to members as against the 800 at Fond’roy) was the subject of a luxurious renovation and significant refurbishment so as to adapt it to the special needs of our members.

It was in 1618 that Duke Alexandre de Bournonville and his wife Anne de Melun, who owned a number of buildings on the “Wollen Dries” (the present rue aux Laines), on land that had belonged to the Duchy of Brabant since the Middle Ages, had these buildings transformed into a vast Renaissance- style palace.

In the XVIIIth century, the heirs of the Duke of Bournonville sold the property to the Counts of Merode-Waterloo, who had become princes. They in turn transferred it to an estate agency in 1954. In 2008, the latter gave the keys of this exceptional property to the Cercle de Lorraine, aware that the Cercle was the body best able to return the Palace of Bournonville to its former glory.

The Palace of Bournonville has left its mark on the history of the figurative arts. At different periods, individuals whose names are engraved in history lived in the palace: Marie de Médicis and Olympe Mancini, mother of Prince Eugène de Savoie, at the beginning of the XVIIth century and, at the end of that same century, the Count of Coblenz and the Prince of Starhenberg, who, during the XVIIIth century, administered the country while it was under Austrian rule.

Articles of Association

Designation - Term

The Association is known as the Cercle de Lorraine/ Club van Lotharingen. This designation must invariably be preceded or followed by the initials “asbl” [non-profit making association].

The Association is constituted for a limited term.

Head Offices

The head offices of the Association are located at 1000 Bruxelles, place Poelaert. + 32 2 374 65 25

Aim and business

The not for profit goal pursued by the Association comprises participation, by any possible means, in the conservation and improvement of all exceptional properties, such as outstanding dwellings and gardens, whether historic or contemporary, so as to contribute to their preservation, restoration and development for tourism purposes as well as to the promotion and cultural influence of their heritage.

To achieve its purpose and bring together the assets needed to this end, the business of the Association was to establish a business club, based in Belgium. The club would carry on its activities under the names “Cercle de Lorraine” and/or “Club van Lotharingen”.

The Association may take any actions relating directly or indirectly to its goal. It may also provide its support to and become involved in any activity meeting objectives similar to its own.

It may provide financial assistance, in the form of donations, loans, advances and subsidies in respect of operating losses, or take stakes in any individual or corporate entity which contributes directly or indirectly to or assists in the achievement of its goal.

Full members

The number of full members may not be less than three.
Any person admitted in this capacity by a qualified majority of 75% of votes at the General Meeting shall be deemed a full member.

Associate members

Two categories of associate members are hereby created:
- Associate members, and
- Honorary associate members.

1. Any person admitted in such capacity by decision of the Board of Directors or of any body to which the Board of Directors delegates this task, shall be deemed an Associate member. Such person shall enjoy the title "Member of the Cercle de Lorraine" or "lid van de Club van Lotharingen".

2. Any person admitted in such capacity by decision of the Board of Directors shall be deemed an Honorary associate member. Such persons shall enjoy the title "Member of the Cercle de Lorraine" or "lid van de Club van Lotharingen".
The Association’s Board of Directors may also designate from amongst its Honorary Associate Members, for a term of office that it shall determine, certain persons who appear outstanding in terms of their respectability or commitment to the defence of the Association’s values and grant them the title "President of the Cercle de Lorraine", "Vice-President of the Cercle de Lorraine", "Voorzitter van de Club van Lotharingen" or "Vice voorzitter van de Club van Lotharingen".

Associate members, Honorary associate members, Presidents and Vice-presidents, Voorzitter van de Club van Lotharingen and vice-voorzitter van de Club van Lotharingen shall not enjoy, either individually or jointly, any management or representative powers in relation to the Association, except on a formal basis. They are not therefore liable in respect of the management of Association and may not be so held, since the titles they bear are exclusively honorary or formal.

Procedures for admitting Associate members

The admission of new Associate Members is subject to the following procedures or conditions:
- submission to the Association Secretariat of an application for membership on the appropriate form;
- acceptance of the application by:

o The Board of Directors or the body to which it has delegated this role with respect to an applicant for membership as referred to in Article 5.1 of the Articles of Association;

o The Board of Directors in respect of an applicant member as referred to in Article 5.2 of the Articles of Association.

The decision referred to above shall be take into account the size and reputation of the business within which the applicant is professionally active and the significance of the position he holds as well as his reputation and respectability;

- In respect of Associate Members as referred to in Article 5.1 of the Articles of Association, payment of such one-off entry fee as the General Meeting may, on the advice of the Board of Directors, decide to introduce. This fee may not exceed €5,000, a sum to be up rated on 1 January each year on the basis of the Health section of the Consumer Prices Index of September 2008 and the Sepember preceding the indexation. Where a fraction of a euro occurs, this shall be rounded upwards;
- For these same members, the payment of the annual subscription referred to at Article 9, through which they consolidate their compliance with the Articles of Association and the internal rules of the Association they wish to belong to.
Payment of the membership subscription shall constitute compliance with these Articles of Association.

Finality of Admission decisions

Decisions regarding the grant or refusal of admission to an applicant for membership, in whatever category, shall be final and must not in any instance or in any way be explained. 

Resignations - expulsions

Whichever categories they belong to, members are free to resign from the Association at any time by submitting their resignation to the Association’s Board of Directors in writing. Such a resignation shall be effective from the date the notice of resignation is received. The relevant portion of any subscription the resigning member has paid in advance shall not be reimbursed to him.

A full member may only be expelled by a 75% majority of the votes cast or represented at the General Meeting, on the basis of a proposal by the Board of Directors.

The expulsion of an Associate member shall be decided by a simple majority of those present at the relevant meeting of the Board of Directors. In respect of members referred to at Article 5.1 of the Articles of Association, expulsion may be decided, in the same way, by any body to which they Board of Directors may have delegated the task of admitting members.

Any Associate Member who fails to pay the subscription he owes by the end of the month following the month when the deadline specified in subscription request falls due, shall be deemed to have resigned.

In all cases, an expulsion shall be notified to the person concerned by registered letter sent by post and shall take effect on the date the said letter is sent.

Any expulsion decisions taken by the Board of Directors, by the body to whom it has delegated its powers and by the General Meeting shall be final and shall not in any instance or any way be explained. The relevant portion of any subscription the expelled member has paid in advance shall be reimbursed to him.


Associate members shall pay an annual subscription fee determined by the Board of Directors. This fee may not exceed €5,000, a sum to be up rated on 1 January each year on the basis of the Consumer Prices Index of September 2008 and the September preceding the indexation. Where a fraction of a euro occurs, this shall be rounded upwards.

The Board of Directors may, on the basis of criteria it shall freely determine, permanently or temporarily exempt certain Associate Members from the payment of the subscription fee.

General Meeting

The General Meeting shall be composed of solely of full members.

The Ordinary General Meeting shall take place annually, at Headquarters, on the fourth Thursday of the month of May, or, if this is a public holiday, the day immediately following, and shall be convened by the Chairman of the Board of Directors or the delegated Administrator.

The General meeting may also be convened by the Board of Directors in any circumstances laid down by law or the Articles of Association: it must be convened if at least one fifth of the full membership has so requested.

The General Meeting shall have the powers attributed to it by law or these Articles of Associations.
It shall rule on:
- any amendment to the Articles of Association;
- the appointment or dismissal of any administrators and, as necessary, auditor(s);
- the determination of any remuneration payable to the auditor(s);
- the admission, expulsion or acceptance of any full member;
- the approval of the annual accounts for the previous tax year and the budget for the tax year to come;
- payments made to administrators, deputy administrators and any auditor(s);
- The voluntary winding-up of the Association.

Only full members shall be called to attend General Meetings. They may only be represented at such meetings by another full member. A full member may represent a maximum of two of his colleagues.

Invitations to attend shall be issued by letter missive, facsimile or email, sent at least eight days prior to the General Meeting and including the Agenda.
Save in instances where the law or these Articles of Association require a special majority, decisions shall be taken on the basis of a simple majority of the votes of full members present or represented.

Every full member shall have on equal vote. In the event of a tied vote, the Chairman’s vote shall be decisive. The Chair of the General Meeting shall be the Chair of the Board of Directors or, where this is not possible, the oldest member present at the General Meeting.
Provided all the full members are present, the General Meeting may vote on items not included in the Agenda.

The minutes of General Meetings shall be kept in a register provided for this purpose and signed by at least two full members. This register shall be kept at the Headquarters of the Association where it may be consulted by any full member, by administrators or any interested third parties.

Financial year

The financial year shall begin on the first day of January and end on the 31th of December.

Board of Director - powers

The Association shall be administered by a Board of Directors, which shall operate collegially.

Without prejudice to the provisions of the law, the Board of Directors shall be composed of at least three administrators appointed by the General Meeting from amongst the full and associate members, or from outside, and such appointments may be revoked by the General Meeting. The term of their mandate, which is renewable, is set at 4 years and shall be exercised free of charge.
Any administrator shall put his mandate at the disposal of the General Meeting immediately following the date when he attains the age of 70 years.

The Board shall designate from amongst its members a Chair, a Deputy Administrator, a Treasurer and a Secretary.

The Deputy Administrator shall be personally responsible for day to day management and shall in this capacity undertake any action necessary to the proper operation of the Association. Thus, in particular, he shall enjoy the power, on the sole basis of his signature, to contract all types of loans and to commit the Association as applicant or respondent before the courts as well as the capacity to buy, sell, rent out or mortgage any property held in full ownership or on lease by the Association. He shall be chosen from within the Board of Directors who may appoint or dismiss him. The amount of any remuneration he may receive shall be determined by the Board of Directors.

The Board of Directors shall hold the widest possible powers to administer and manage the Association, as well as any powers not specifically attributed to the General Meeting by law or by these Articles of Association.

It may appoint various Committees, each being composed of at least two administrators:

1. A “Voting Committee” responsible for ruling on membership applications submitted by the applicant members referred to in Article 5.1 of these Articles of Association;
2. An “Auditing and Remuneration Committee” the role of which shall be to monitor accounting, to cooperate closely with any auditor(s) and to check that the remuneration paid to the Association’s managers is in accordance with market rates;
3. An “Appropriations Committee” that shall be empowered to consider requests for the grant of any subsidies, aid, gifts and support in the context of the benevolent aims pursued by the Association.

Any recommendations made by the “Appropriations” and “Auditing and Remuneration” committees shall be submitted for the approval of the Board of Directors.
Any documents that bind the Association shall, unless this power is specially delegated by the Board of Directors, be signed by the Deputy Administrator acting alone or by two administrators.

Administrators shall not be obliged to provide proof of their powers to third parties.
Any delegation of powers provided for in these Articles of Association carries with it the delegation of a power of signature within the limits of the delegated powers.

Save where the law or these Articles of Association provide otherwise, the decisions of the Board of Directors shall be taken by a majority of the votes of the administrators present or represented. In the event of a tied vote, that of the Chairman, or in his absence, of the administrator representing him, shall be decisive. Each administrator may cause himself to be represented by another administrator. An administrator may represent a maximum of two of his colleagues.

The minutes of the Board of Directors shall be kept in a register provided for this purpose and signed by at least two administrators. This register shall be kept at the Headquarters of the Association where it may be consulted by any full member and by the administrators.


In the event that the Association is liquidated, any net assets shall be transferred to a non-profit making organisation pursuing a goal similar to that of the Association or, where this is not possible, the non-profit making organisation that has the goal closest to that which the Association would have pursued were it still operating.

In the event of voluntary winding-up of the Association, the General Meeting shall designate the liquidator or liquidators, set their remuneration and choose the entity that is to receive any net assets.

Internal rules- GDPR

Regulation - GDPR

The Cercle de Lorraine’s regulations

Access to the Cercle

Access to the Cercle is reserved for people whose candidacy has been accepted by the voting committee, an independent body whose members have been appointed by the board of management.  Members of correspondent clubs can have access to the Cercle under the same conditions as our members, on condition that they have registered and presented an introduction letter from the correspondent club to the secretariat.

Admission of new members

To present a candidacy for membership, an admission application must be written on the form foreseen for that purpose and it must be sent to the Cercle’s secretariat.  The voting committee will deliver its decision, which is sovereign, without needing to justify it. 

Membership card

A membership card will be issued to each new member of the Cercle after the amount of their membership dues has been paid.


For information and reservations: the secretariat is accessible 8.30 a.m. - 5.30 p.m.
(Tel: +32 2 374 65 25 – Fax: +32 2 374 06 15 - Email:

Opening hours

The Cercle is open weekdays and closed weekends and public holidays.  The restaurant is accessible from Monday to Friday from 12 noon to 3.00 p.m. and in the evenings, including weekends, by reservation only, for a minimum of 25 people.  The bar is open from 11.30 a.m. to 3.30 p.m.
The management can decide to close the Cercle during certain periods of the year when members’ presence is generally reduced (‘bridges’, ‘holidays’).

Private events

Members may organise private events in the Cercle’s premises, even outside the normal opening hours, depending on the availability of the premises and the activities calendar of the Cercle.  The main restaurant and the Brasserie can be reserved for a private event only in the evenings or at weekends.  However, the 10 function rooms are available to members for private events during the daytime.  All the function rooms can be reserved in the evenings for cocktail parties and dinners, as long as there are a certain number of guests.  (Tariffs can be requested from:
Evening events with dancing can be authorised under certain conditions.


Private Life and Personal Data Protection Policy


Cercle de Lorraine – Club van Lotharingen (hereinafter called "CL") gives great importance to the manner in which your personal data are treated and recognises the importance of protection of your private life.

This Private Life and Personal Data Protection Policy (hereinafter called the “Policy”) explains how CL collects, processes and protects your personal data.  It contains information on the type of data collected by CL, how the data are processed, for what purpose and how you can exercise your rights in relation to your personal data.

Contact CL at the dedicated email address: for all types of demands, requests, or comments in relation to the protection of personal data, or if you wish to exercise one of the rights pertaining thereto (see point IV. Your rights).


I.             Basic principles – CL’s commitment to protection of private life

CL pledges to protect the personal data to which they have access, to process the data in a responsible manner and to be transparent in the practises they have put in place.  CL gives a great deal of importance to the trust shown in its organisation and pledges to respect the following principles:


·         you are under no obligation to provide the personal data requested by CL.  However, if you decide not to provide certain data, it is possible that CL cannot provide certain services or deliver certain products;

·         CL collects and processes your data solely for the purposes that are described in the present Policy or for specific purposes of which you will be informed by CL and/or to which you have given your consent;

·         CL has adopted the principle of minimization of the collection of personal data: which means collecting and processing only that personal data which is necessary for the purposes envisaged;

·         CL’s objective is to maintain your personal data as precise and up-to-date as possible and CL offers you the possibility to modify your data at any time by accessing your profile in the member section of the website or by submitting a request directly to the email address:;

·         If the personal data in CL’s possession is no longer of use and there is no legal obligation for CL to keep them, CL will do their utmost to delete or destroy them, or render them anonymous.

·         Under no circumstances will your personal data be sold or rented out, they will only be shared or divulged for purposes related to the present Policy except for circumstances where communicating them is required by law and/or governmental authorities.


II.           What personal data does CL collect?

The personal data that CL collects vary depending upon the purpose of the service that CL is providing or that you are providing to CL. 


It could arise that CL will collect the following categories of personal data directly:

a)     personal contact details such as your surname, first name, email address, postal address and telephone number(s):

b)    the identifier used to access your online account (which you can change and personalise at will), either the username or the password.  This is necessary so that CL can create a personal user account accessible online linked to their activities via their internet sites and applications;

c)      exchanges with CL, which can include details of conversations that have taken place via email or messages on CL’s social network pages;

d)     demographic information such as your age, birthday, the type of person you are and your life style preferences (for the personalisation of CL’s activities and services);

e)     surfing history, such as pages visited, date of the visit, location at the time of the visit, or the IP address;

f)       history of your reservations and what you have selected when in the restaurant or bar, as well as your history of parking and activities;

g)     information concerning your health or, more specifically, whether you have any food allergies;

h)     information regarding third parties, such as personal data relating to family members when you have given these data to CL directly because of special events;

i)       if you apply for a job at CL, we will collect additional personal data, such as information about previous jobs you have had, your education, and references from your former employers.


CL can also collect personal data about you indirectly when:

a)     you share content on social networks, internet sites or applications related to their products or services, or when responding to posts and promotional advertisements on social networks;

b)     CL reads or gathers personal data concerning you through information collected by other internet sites or collected from social networks or public profiles.


III.         For what purpose are your personal data collected by CL?

CL collects your personal data notably in order to provide you with a service that is best suited to your expectations, and for communication purposes or in order to send you information about their activities.  In particular, CL can collect, hold, use and divulge your personal data for the following purposes:


a)        to process your payment when you purchase their products or services;

b)         to handle and respond to your requests for information and to contact you in order to respond to your demands and/or requests;

c)         to develop and improve their products, services, communication methods and the functionality of their internet sites and/or applications;

d)         to send information to you and to manage your registration and/or subscription to our newsletter service or any other service involving sending communications;

e)        to manage every day services related to your affiliation, participation in competitions, drawing of lots, promotional activities, activities or privileges and special offers for members;

f)         to authenticate the identity of individuals who contact CL by telephone, electronically or otherwise;

g)        for the purpose of  maintaining the quality of their services;

h)        to understand better and evaluate our clients’ interests and the desires of our members in order that the activities on offer evolve;

i)         to provide personalised products and customised communications and to recommend products or services related to your needs.


CL may also need your personal data to satisfy legal obligations within the framework of any contractual relationship that CL may have with you.


IV.        Your rights

When CL handles your personal data, you have a certain number of rights that you can exercise at any time.  You can exercise your rights by writing to the specially dedicated email address:


a)     Right of access: you can obtain information concerning the processing of your personal data as well as a copy of the data in question.

b)     Right of rectification: if you think that your personal data are incorrect or incomplete, then you can ask that your personal data be modified accordingly.

c)      Right to have data removed: you can ask that your personal data be obliterated.

d)     Right to processing limits: you can ask that there be a limitation to the processing of your personal data.

e)     Right of opposition: you can oppose the processing of your personal data for reasons related to your specific situation.  You have the absolute right to oppose the processing of your personal data for purposes of direct marketing.

f)      Right to withdraw your consent: if you have given your consent for your personal data to be processed, you also have the right to withdraw this consent at any time.

g)     Right to the portability of your data: when this right is applicable, you have the right that the personal data that you have provided to us be returned to you or, when this is technically possible, to have them transferred to a third party.

h)     The right to make a complaint to the authority in control: You have the right to submit a complaint directly to the authority in control regarding the manner in which we are handling your personal data.


V.          How does CL protect your personal data?

CL is aware of how important it is that your personal data be secure.  CL does its utmost to protect your personal data from incorrect utilisation, interference, damage, unauthorised access, modification or any divulgation.  Numerous security measures have been put in place to help you to protect your personal data.  Notably, CL uses access controls, firewalls and secured servers.


VI.        Sharing your personal data

When CL shares your personal data with other organisations (correspondent clubs, for example), they ensure that these organisations respect the laws governing protection of private life and, specifically, that they possess the necessary mechanisms so that your data and data storage are secure.


Under no circumstances will your personal data be sold or rented out, nor will they be shared or divulged, unless it relates to a purpose connected with the present Policy, or unless communication of such data would be required by law and/or by governmental authorities.


VII.      International transfer of your data

Personal data can be handled outside the European Economic Area (EEA).  If this should be the case, CL will do everything possible to ensure that this international transfer of data be subject to a level of adequate security guarantees.


VIII.     Cookies

CL uses cookies to ensure the smooth running order of their site, to analyse the traffic and offer the best user experience possible to visitors to their site.  There are three types of cookies:


1.      Statistical analysis cookies

2.      Technical cookies 

3.      Social network cookies


For additional information, please refer to CL’s Cookie Policy.


IX.        Contact us

If you have questions, comments or complaints regarding this Policy, or concerning how your personal data is handled, please contact CL by writing to the specially dedicated email address:




 Cookie policy


1.  What are cookies?

A cookie is a small file containing text that a website saves to your computer or your mobile device when you visit the site and you have not configured the parameters to avoid this occurring.  Cookies are widely used to make a website function, or to make it function more efficiently, as well as providing information to the site owners.


2.  How do we use cookies?

·         Statistical analysis cookies 

The statistical cookies are issued by our technical service providers (Google Analytics, Digiworks) in order to measure the audience for the different content and headings on our site, in order to evaluate them and organise them better.  Typically, the data collected are, for example: number of visitors, time spent on a page, type of page consulted subsequently.

If the need arises, these cookies can also allow for the detection of browsing problems and, consequently, the ergonomics of our services can be improved.

These cookies only produce anonymous statistics and volumes of frequentation, this does not include individual information.

You may refuse to use Google Analytics cookies by downloading and installing the complementary Google Analytics Opt-out Browser Add-on for the deactivation of Google Analytics.

Module complémentaire du navigateur pour la désactivation de Google Analytics

·         Technical cookies 

These cookies are indispensable for surfing the site.  They allow access to the site’s products and services.  They allow users to browse the site rapidly and efficiently.  The standard cookies allow you to adapt the presentation of the site according to the display preferences of your terminal (language used, resolution of display); it stores passwords and other information relative to the user.  For example, they serve as your member space, the calendar and your registrations for activities and the restaurant.

·         Social network cookies 

The “social network” cookies enable you to share the contents of our site with other people, or to allow these other people to know what you are consulting or your opinion regarding the content of the site.  Notably, this is the case for the “share” icon posted by Facebook, Twitter or LinkedIn.  The social network providing this application icon is likely to identify you through the icon, even if you have not used it when consulting our site.


3.  How to manage cookies?

You can manage and delete cookies as you wish.  You can delete all the cookies already registered on your computer and you can configure the majority of browsers to prevent registration of cookies.

Everything you need to know about cookies.

Tout savoir sur les cookies


4.  Managing cookies on your browser

The majority of browsers allow you to:

- consult cookies that have been created and delete them individually;

- block cookies created by third parties;

- block cookies created by certain sites;

- block all cookies, whatever their origin;

- delete all cookies when you close your browser.

If you decide to delete your cookies, be aware that all the preferences that you have defined will be lost.  Moreover, if you block all cookies, several websites will no longer operate correctly.