Ibn Saud, the founder of Saudi Arabia, had named himself King of the Nejd, following the collapse of Ottoman Empire power during the Great War. In 1925 he took control of Hejaz from the Hashemites. In 1932, he proclaimed the merger of the Nejd and Hejaz Kingdoms, establishing the Saudi Arabian Kingdom. Most of the boundaries remained unmapped, unmarked, and undemarcated by treaty. He was described as "a modern Solomon", as "Cromwell of the Desert", and as both the Napoleon and the Bismarck of Arabia. A treaty was made in 1931 but soon broken. In November 1933, the Yemenis advanced on Najran