evidence: Other sultanates in the area had close relations with the Royal House of Brunei, being in some cases effectively under the hegemony of the Brunei ruling family for periods of time, such as the Malay sultans of Pontianak, Samarinda and as far as Banjarmasin who treated the Sultan of Brunei as their leader. The Malay Sultanate of Sambas in present-day West Kalimantan, the Sultanate of Sulu, and the Kingdom of Luzon had formed dynastic relations with the royal house of Brunei. The Sultanate of Sarawak (covering present-day Kuching, known to the Portuguese cartographers as Cerava, and one of the five great seaports on the island of Borneo), though under the influence of Brunei, was self-governed under Sultan Tengah before being fully integrated into the Bruneian Empire upon the Tengah's death in 1641.[38][39][40]