A series of diplomatic documents initialled in Locarno 16 Oct 1925 and formally signed in London 1 Dec 1925. The pact settled the question of French security, and the signatories - Britain, France, Belgium, Italy, and Germany - guaranteed the existing frontiers between Germany and France, and Germany and Belgium. The prime mover in the pact was British foreign secretary Austen Chamberlain. Following the signing of the pact, Germany was admitted to the League of Nations.