Mandatory Iraq

The Kingdom of Iraq under British Administration, or Mandatory Iraq (Arabic: الانتداب البريطاني على العراق, romanized: al-Intidāb al-Brīṭānī ʿalā l-ʿIrāq), was created in 1921, following the 1920 Iraqi Revolution against the proposed British Mandate of Mesopotamia, and enacted via the 1922 Anglo-Iraqi Treaty and a 1924 undertaking by the United Kingdom to the League of Nations to fulfil the role as Mandatory Power.

Faisal ibn Husayn, who had been proclaimed King of Syria by a Syrian National Congress in Damascus in March 1920, was ejected by the French in July of the same year. Faisal was then granted by the British the territory of Iraq, to rule it as a kingdom, with the British Royal Air Force (RAF) retaining certain military control, but de facto, the territory remained under British administration until 1932.

The civil government of postwar Iraq was headed originally by the High Commissioner, Sir Percy Cox, and his deputy, Colonel Arnold Wilson. British reprisals after the capture and killing of a British officer in Najaf failed to restore order. The British occupiers faced the growing strength of the nationalists, who continued to resist against the British authority. British administration had yet to be established in Iraqi Kurdistan.

Although often thought to have been invented by the British after World War I, Iraq had long existed as a distinct region under the Ottoman Empire, encompassing the provinces of Mosul, Baghdad, and Basra and officially referred to as 'the Iraq Region'.