In Borneo, as elsewhere, the Malays had for long been notorious pirates, but the Sea-Dayaks, only so far as consisted in spasmodic raids for the acquisition of heads.
The Malay governors, now under the influence of the Arab pseudo-sherips, diverted whole tribes of Dayaks from their peaceable avocations, and converted them into sea-robbers. The cultivation of their lands to produce saleable goods, for which there was now no sale, was abandoned, and fertile districts that had grown abundant crops were reduced to unprofitable jungle.
But it was not only on trading vessels in the China seas that they were taught to prey. The Malay princes and nobles sent those tribes whom they had demoralised to ascend the rivers and plunder and exterminate the peaceful tribes in the interior.
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]