On 13 May 1950, Paul-Henri Spaak, former Belgian Prime Minister, gives a rather negative assessment of the influence of existing international organisations on the process of European integration.

Winston Churchill and Paul-Henri Spaak participate in the first congress organised by the International Council of the European Movement, held in Brussels from 25 to 28 February 1949.

From 25 to 28 February 1949, in Brussels, the International Council of the European Movement holds its inaugural session, during which European activists call, in particular, for the adoption of a European Charter of Human Rights and adopt the statute for a European Court. In the centre: Winston Churchill, former British Prime Minister; seated: Paul-Henri Spaak, Belgian Foreign Minister.

On 17 and 18 January 1966, the Foreign Ministers of the Six meet in Luxembourg for an Extraordinary Council to try to reach a political compromise that will provide a favourable outcome to the empty chair crisis. In the centre, Belgian Foreign Minister Paul-Henri Spaak at the Luxembourg meeting.

In a letter sent on 2 June 1964 to Fernando María Castiella, Spanish Minister for Foreign Affairs, Paul-Henri Spaak, President-in-Office of the Council of the European Economic Community (EEC), responds favourably to the Spanish Government’s request to begin exploratory talks in order to consider the links to be established between Spain and the EEC.

In a letter sent on 14 February 1964 to Paul-Henri Spaak, President-in-Office of the Council of the European Economic Community (EEC), the Count of Casa Miranda, Head of the Spanish Diplomatic Mission to the European Communities, renews the Spanish Government’s application for association with the EEC.

On 13 April 1955, Jean Monnet, the outgoing President of the High Authority of the European Coal and Steel Community (ECSC), and Pierre Uri, Director of the General Economy Division of the High Authority, draw up an unofficial draft Declaration — for the attention of Paul-Henri Spaak — for the Conference which the Foreign Ministers of the six Member States of the ECSC are scheduled to attend in late May.

On 15 April 1955, Jean Monnet, the outgoing President of the High Authority of the European Coal and Steel Community (ECSC), and Pierre Uri, Director of the General Economy Division of the High Authority, draw up an unofficial draft Communiqué — for the attention of Paul-Henri Spaak — for the Conference which the Foreign Ministers of the six Member States of the ECSC are scheduled to attend in late May.

In 1981, Robert Rothschild, former Head of the Private Office of Belgian Foreign Minister Paul-Henri Spaak, looks back at the main stages of the European revival and of the negotiations for the Treaty establishing the European Economic Community (EEC).

From 27 to 29 April 1956, with the help of the Socialist Movement for the United States of Europe (SMUSE), the European Congress of Labour — attended by Paul-Henri Spaak, Sicco Mansholt, Guy Mollet and Jean Monnet — holds a meeting in Paris, at the end of which it adopts a resolution in which it expresses its support for the establishment of a Common Market and emphasises its agricultural, social and institutional implications.