In 1730, the new Shah of Persia, Nader Shah, sought to re-assert Persian sovereignty in Bahrain. He ordered Latif Khan, the admiral of the Persian navy in the Persian Gulf, to prepare an invasion fleet in Bushehr. The Persians invaded in March or early April 1736 when the ruler of Bahrain, Shaikh Jubayr, was away on hajj. The invasion brought the island back under central rule and to challenge Oman in the Persian Gulf. He sought help from the British and Dutch, and he eventually recaptured Bahrain in 1736. During the Qajar era, Persian control over Bahrain waned and in 1753, Bahrain was occupied by the Arabs of Abu Shahr of the Bushire-based Al Madhkur family, who ruled Bahrain in the name of Persia and paid allegiance to Karim Khan Zand.