Sultanate of Sulu

The Sultanate of Sulu (Tausug: Kasultanan sin Sūg; Central Sama: Kasultanan Sūg or Kasultanan Sūk; Malay: Kesultanan Suluk; Filipino: Kasultanan ng Sulu or Sultanato ng Sulu) was a Sunni Muslim Tausūg state that ruled the Sulu Archipelago, coastal areas of Zamboanga City, and certain portions of Palawan in today's Philippines, alongside parts of present-day Sabah and North Kalimantan in north-eastern Borneo.

The sultanate was founded either on 17 November 1405 or 1457 by Johore-born explorer and Sunni religious scholar Sharif ul-Hashim. Paduka Mahasari Maulana al Sultan Sharif ul-Hashim became his full regnal name; Sharif-ul Hashim is his abbreviated name. He settled in Buansa, Sulu. The sultanate gained its independence from the Bruneian Empire in 1578.

At its peak, it stretched over the islands that bordered the western peninsula of Zamboanga in Mindanao in the east to Palawan in the north. It also covered areas in the northeast of Borneo, stretching from Marudu Bay, Sabah to Tepian, Sembakung subdistrict, North Kalimantan. Another source stated the area included stretched from Kimanis Bay, which also overlaps with the boundaries of the Bruneian Sultanate. Following the arrival of western powers such as the Spanish, the British, the Dutch, French, Germans, and the Americans, the Sultan thalassocracy and its sovereign political powers were relinquished by 1915 through an agreement, known as the Carpenter Agreement, that was signed with the United States. The Sultanate after 1915 continued to exist a ceremonial institution of varying recognition.