British Mandate of Palestine
The British Mandate of Palestine was a League of Nations mandate to the United Kingdom in Palestine. It began after the British had conquered Palestine from the Ottoman Empire in World War I. At the San Remo Conference, on April 25, 1920, the mandate for Palestine was granted to Britain. The mandate became officially operative on September 29, 1923. The mandate ended when the British returned it to the United Nations on May 15, 1948.