once again sailed with a fleet to Bahrain however, the Al Khalifa enlisted the aid of Wahhabis from the mainland which forced the Omanis to abort their invasion. Treaties with Britain In 1820, the Al Khalifa tribe regained power in Bahrain and entered a treaty relationship with Great Britain, by then the dominant military power in the Persian Gulf. This treaty recognised the Al Khalifa as the rulers ("Al-Hakim" in Arabic) of Bahrain. It was the first of several treaties including the 1861 Perpetual Truce of Peace and Friendship, which was further revised in 1892 and 1951. This treaty was similar to those entered into by the British Government with the other Persian Gulf principalities. It specified that the ruler could not dispose of any of his territory except to the United Kingdom and could not enter into relationships with any foreign government without British consent. In return the British promised to protect Bahrain from all aggression by sea and to lend support in case of land attack. More importantly, the British promised to support the rule of the Al Khalifa in Bahrain, securing its unstable position as rulers of the country. According to School of Oriental and African Studies academic, Nelida Fuccaro, this treaty relationship with Britain was one aspect of an evolving polity: After the Egyptian ruler, Mohammad Ali Pasha took the Arabian Peninsula from the Wahhabis on behalf of the Ottoman Empire in 1830, the Egyptian army demanded yearly tributes from Sheikh Abdul Al Khalifa. He had earlier sought Persian and British protection from the Egyptians. The Sheikh agreed to the terms of the Egyptians. In 1860, the Government of Al Khalifa used the same tactic when the British tried to overpower Bahrain. Sheikh Mohammad bin Khalifa Al Khalifa wrote letters to both the Persian Prince-Governor of Fars and to the Ottoman Wali of Baghdad, to place Bahrain in the protection of each respective state. Both sides sent wakils (a person who is an authorised representative), who offered the Sheikh their conditions, of which the Ottoman terms were more beneficial and was accepted in March 1860. In another letter to the Iranian Foreign Minister, Sheikh Mohammad demanded that the Government of Iran provide direct guidance and protection from British pressure. Later on, under pressure from Colonel Sir Lewis Pelly, Sheikh Mohammad requested military assistance from Iran, but the Government of Iran at that time provided no aid