The San Remo conference was an international meeting of the post-World War I Allied Supreme Council as an outgrowth of the Paris Peace Conference, held at Castle Devachan in Sanremo, Italy, from 19 to 26 April 1920. The San Remo Resolution passed on 25 April 1920 determined the allocation of Class "A" League of Nations mandates for the administration of three then-undefined Ottoman territories in the Middle East: "Palestine", "Syria" and "Mesopotamia". The boundaries of the three territories were "to be determined [at a later date] by the Principal Allied Powers", leaving the status of outlying areas such as Zor and Transjordan unclear. The conference was attended by the four Principal Allied Powers of World War I who were represented by the prime ministers of Britain (David Lloyd George), France (Alexandre Millerand), Italy (Francesco Nitti) and by Japan's Ambassador Keishirō Matsui.