Abdul Kahar was the sixth Sultan of Brunei. He ruled from 1524 until stepping down from the throne in 1530 to allow his nephew and adopted-son Saiful Rijal to become Sultan .. When his son ascended to the throne, Abdul Kahar acted as Regent with the title Paduka Seri Begawan Sultan. After his demise in 1578, he was known as Marhum Keramat.
The earliest historical record of the Sultans of Brunei is not clearly known due to the poor early documentation of Brunei's history. Many elder members of the House of Bolkiah claim that their ancestors were the BaHassan and BaAlawi Saadah from Tarim and Hadhramawt in Yemen. In addition there has been an effort to Islamise the history, with the "official history" not matching up with verifiable foreign sources. The Batu Tarsilah, the genealogical record of the kings of Brunei, was not started until 1807 CE.