Strasbourg been populated since the middle Paleolithic. Between 362 and 1262, Strasbourg was governed by the bishops of Strasbourg; their rule was reinforced in 873 and then more in 982. In 1262, the citizens violently rebelled against the bishop's rule (Battle of Hausbergen) and Strasbourg became a free imperial city. It became a French city in 1681, after the conquest of Alsace by the armies of Louis XIV. In 1871, after the Franco-Prussian War, the city became German again, until 1918 (end of World War I), when it reverted to France. After the defeat of France in 1940 (World War II),
European institutions in Strasbourg been based in Strasbourg since 1920 (headquarters located in the Palais du Rhin). Its function is to encourage European prosperity by guaranteeing a high level of security for navigation of the Rhine and environs. However the bulk of the European presence in Strasbourg comes from the post-Second World War establishment of institutions. The move towards European integration pushed for the creation of new bodies. The first of these to be established was the International Commission on Civil Status, founded in 1948 and predating the Council of Europe by a few months. The progressive establishment of a peaceful, unified and prosperous