At the San Remo conference, the principal Allied Powers of World War I adopt a resolution to determine the allocation of Class "A" League of Nations mandates for administration of the former Ottoman-ruled lands of the Middle East.

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.