The Four Power Agreement on Berlin also known as the Berlin Agreement or the Quadripartite Agreement on Berlin was agreed on 3 September 1971 by the four wartime Allied powers, represented by their ambassadors. The four foreign ministers, Alec Douglas-Home of the United Kingdom, Andrei Gromyko of the Soviet Union, Maurice Schumann of France, and William P. Rogers of the United States signed the agreement and put it into force at a ceremony in Berlin on 3 June 1972.[1] The agreement was not a treaty and required no formal ratification.