The Treaty of Darin, or the Darin Pact, of 1915 was made between the United Kingdom and Abdulaziz Al Saud (sometimes called Ibn Saud), ruler of the Emirate of Nejd and Hasa, who founded the Kingdom of Saudi Arabia in 1932.
The treaty was signed at Darin, on the island of Tarut[1] on 26 December 1915 by Abdulaziz and Sir Percy Cox on behalf of the British Government.
[2] The treaty made the lands of the House of Saud a British protectorate and attempted to define its boundaries.
[2] Following the treaty, Abdulaziz obtained the following from the British: recognition as the ruler of Najd and its dependencies under British protection; a loan of £20,000 and a shipment of arms in June 1916; a monthly stipend of £5,000 and from the end of World War I to March 1924 an annual stipend of £60,000 in January 1917.
[5] Additionally, the British aim was to secure its Persian Gulf protectorates, but the treaty had the unintended consequence of legitimising Saudi control in the adjacent areas.