In 1854, a deed of cession of the Omani Kuria Muria islands to Britain was signed by the sultan of Muscat and the British government. The British government achieved predominating control over Muscat, which, for the most part, impeded competition from other nations. Between 1862 and 1892, the Political Residents, Lewis Pelly and Edward Ross, played an instrumental role in securing British supremacy over the Persian Gulf and Muscat by a system of indirect governance. By the end of the 19th century, and with the loss of its African dominions and its revenues, British influence increased to the point that the sultans became heavily dependent on British loans and signed declarations to consult the British government on all important matters. The Sultanate thus came ''de facto'' under the British sphere.