The Locarno Treaties were seven agreements negotiated at Locarno, Switzerland, on 5–16 October 1925 and formally signed in London on 1 December, in which the First World WarWestern EuropeanAllied powers and the new states of Central and Eastern Europe sought to secure the post-war territorial settlement, and return normalizing relations with defeated Germany (which was, by this time, the Weimar Republic). Ratifications for the Locarno treaties were exchanged in Geneva on 14 September 1926, and on the same day they became effective. The treaties were also registered in the League of NationsTreaty Series on the same day.