First published by the War Office in 1921, this third edition is based on previous maps and aerial charts. Following WWI, the Holy City of Medina, relinquished from ottoman rule, formed part of Hejaz, the western region of Arabia. It had been under the direct control of the Ottomans from 1845, governed by an appointed official known as the Sharif of Mecca. In 1925, it was conquered by Ibn Saud, who combined the kingdoms of Hejaz and Nejd in 1932 to form Saudi Arabia. Al Saud now controlled almost the entire Arabian peninsula, with the exception of Yemen; Ibn Saud's attempts to claim Yemeni land sparked the war of 1934. Medina fell into the new Kingdom of the Hejaz.