Brussels and the European Union a provisional seat, though with the Common Assembly in Strasbourg as that was the only city with a large enough hemicycle (the one used by the Council of Europe). This agreement was temporary, and plans were set to relocate the institutions to Saarbrücken which would serve as a "European District", but this did not occur. The 1957 Treaties of Rome established two new communities, the European Economic Community (EEC) and the European Atomic Energy Community (Euratom). These shared the Assembly and Court of the ECSC but created two new sets of Councils and Commissions (equivalent to the ECSC's High Authority).
History of the European Coal and Steel Community (1945–57) Community (Euratom). The latter body fostered co-operation in the nuclear field, at the time a very popular area, and the EEC was to create a full customs union between members. Louis Armand became the first President of Euratom Commission and Walter Hallstein became the first President of the EEC Commission. History of the European Coal and Steel Community (1945–57) The period saw the first moves towards European unity as the first bodies began to be established in the aftermath of the Second World War. In 1951 the first community, the European Coal and Steel Community was established and moves on