Kingdom of Nejd and Hejaz

The Kingdom of Nejd and Hejaz was a dual monarchy established by Abdulaziz ibn Saud after his conquest of the Kingdom of Hejaz in 1925. Ibn Saud, the Sultan of Nejd, was crowned King of Hejaz in the Masjid al-Haram in Mecca on 8 January 1926, and on 29 January 1927 he elevated Nejd to the status of a kingdom. The resulting state was known initially as the Kingdom of Hejaz and Sultanate of Nejd, and after 1927 as the Kingdom of Hejaz and Nejd. It was recognized by the United Kingdom at the Treaty of Jeddah on 20 May 1927. For the next five years Ibn Saud administered the two parts of his realm separately while continuing to expand his control over the Arabian Peninsula. On 23 September 1932 he proclaimed the union of Nejd, Hejaz, al-Hasa and Qatif as the Kingdom of Saudi Arabia, bringing the dual monarchy to an end. The kingdom was the fourth iteration of the third Saudi state and the immediate predecessor of modern Saudi Arabia.