Portuguese expansion into the Indian Ocean in the early 16th century followed Vasco da Gama's voyages of exploration in which the Portuguese battled the Ottomans up the coast of the Persian Gulf. The Portuguese, drawn in by the lucrative trade routes of the Gulf, sought control of the strategic Ormus region before setting its sights on Bahrain. Portuguese ships first entered the Gulf in 1485, the first reputed Portuguese traveller to visit Bahrain was Duarte Barbosa. After the Kingdom of Hormuz fell in 1507, Hormuz' political control of Bahrain was lost after the island fell to the princes of Al-Hasa. A combined Portuguese-Hormuz force led by António Correia conquered Bahrain in 1521 only to briefly lose it to the princes of Al-Hasa the same year. In response, the Portuguese sent another expedition to Bahrain and the Arabian coast to subdue the Al-Hasa attempts to regain power.