Political map of South & Southwest Asia 29 July 1913 (Anglo-Ottoman Convention): By now the British dominated the Persian Gulf and the southern Arabian peninsula. To secure its gains in these regions, Britain persuaded the Ottoman Turks to sign the Anglo-Ottoman Convention (Anglo-Ottoman Convention of 1913), effectively renouncing any Ottoman influence over Kuwait, Bahrain, and Qatar. The Turks were having enough problems in Arabia without contesting the British - even as the convention was underway, the Saudis seized al-Hasa (Conquest of al-Hasa (1913)), the last major Ottoman holding in the Gulf.