The Royal Sultanate of Sulu (Sultaniyyah Sin Lupah Sug) is an Islamic Tausug state, a subnational monarchy within an autonomous region in the southern Philippines. Its territories include many islands in the Sulu Archipelago and Northern Borneo (Sabah).
The Sultanate began life in 1405 and was officially founded as a theocratic state in 1457 by a Johore-born Arab explorer and religious scholar Sayyid Abu Bakr Abirin, a direct descendant of the Islamic Prophet Muhammad. After the marriage of Abu Bakr Abirin and a local heiress, Dayang-Dayang (princess of the first degree) Paramisuli, he founded the Sultanate and assumed the title Paduka Mahasari Maulana al Sultan Sharif ul-Hāshim. In the course of the following contacts with Europeans, the Sultanate of Sulu was internationally recognised as a Kingdom (or a Royal Sultanate).