Among the tribes thus changed from an agricultural people into pirates were the Sekrang and the Saribas. When the Malay Muhammadan princes wanted slaves they summoned their Dayak nominal subjects to follow them, and led them against other tribes, either to harry the coasts or to penetrate up the rivers ravaging; and then, from this first stage to a second, converted them into pirates who swept the seas, falling on trading vessels, murdering the crews, and appropriating the plunder. According to agreement the Malay princes received two-thirds of the spoil, and their Dayak subjects, whom they had trained to be pirates, were granted one-third of the plunder and all the heads they could take. About this head-hunting something has been said already, more will be said presently. As a Dayak said to a European, "You like books, we like heads." In the latter half of the seventeenth century, the Sultan of Bruni, Muadin, was constrained to call in the aid of his neighbour, the Sultan of Sulu, to quell an insurrection, and in consideration of this assistance ceded to him the land from the north as far as the Kimanis river. Sultan Abdul Mubin had murdered his uncle, Sultan Muhammad Ali, and usurped the throne. Pangiran Bongsu, under the title of Sultan Muadin, with the assistance of the Sulus, defeated Abdul Mubin, who was executed. Muhammad Ali was murdered in 1662, and a war ensued that lasted about twelve years.[71] The Spaniards attacked Sulu, captured the capital, and carried off the Sultan to Manila. When the English took Manila, under Sir William Draper in 1762, they released the Sultan Mumin, and he ceded the territory that had been granted to his predecessors by the Sultan of Bruni in or about 1674 to the East India Company, by deed signed in 1763, in consideration of an engagement entered into by the Company to protect him from the Spaniards. Sultan Jemal ul Alam, of Bruni, who died in 1796, married Rajah Nur Alam, daughter of his uncle Sultan Khan Zul Alam, 21st Sultan of Bruni, by his first wife. By her he had one legitimate son, Omar Ali Saif Udin. The wife of Sultan Jemal had a full brother, Sri Banun Muda (usually called Rajah Api), and also half-brothers Hasim and Muhammad, sons of Khan Zul Alam by his second wife, and Bedrudin and two other sons by his third wife, a Lanun lady of rank.