Interregnum (Transjordan) in the context of "Establishment of the Emirate of Transjordan"

The Emirate of Transjordan (Arabic: إمارة شرق الأردن, romanized: Imārat Sharq al-Urdun, lit. 'the emirate east of the Jordan'), officially the Amirate of Trans-Jordan, was a British protectorate established on 11 April 1921, which remained as such until achieving formal independence as the Kingdom of Transjordan in 1946.

After the Ottoman defeat in World War I, the Transjordan region was administered within OETA East; after the British withdrawal in 1919, this region gained de facto recognition as part of the Hashemite-ruled Arab Kingdom of Syria, administering an area broadly comprising the areas of the modern countries of Syria and Jordan. Transjordan became a no man's land following the July 1920 Battle of Maysalun, during which period the British in neighbouring Mandatory Palestine chose to avoid "any definite connection between it and Palestine". Abdullah entered the region in November 1920, moving to Amman on 2 March 1921; later in the month a conference was held with the British during which it was agreed that Abdullah bin Hussein would administer the territory under the auspices of the British Mandate for Palestine with a fully autonomous governing system.

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.