He was a direct descendant of Shariff Kabungsuwan, a Muslim missionary who preached Islam in the Philippines and established the sultanate after marrying a Sulu princess in the 16th century.
[2] He controlled his nephew, the Rajah Muda or crown prince, after displacing his older brother Sarikula.
So, later, in 1602, he joined forces with Rajah Sirongan to raid Spanish settlements at Cuyo and Calamianes islands with 100 boats that could accommodate over 100 men each.
[3] In 1603, Buisan captured a Jesuit cleric named Melchor Hurtado, thus assuring him enough influence to forge an alliance with the datus of Leyte.
However, after an unsuccessful raid (pangangayaw as it was locally known) in 1606, Buisan distanced himself and the Rajah Muda away from Sirongan and established a new community by the Cotabato coast.