By the next century conquests had reached the Sulu islands in the southern tip of the Philippines where the population was Buddhist and Hindu and they took up the task of converting the animistic population to Islam with renewed zeal. By the 15th century, half of Luzon (Northern Philippines) and the islands of Mindanao in the south had become subject to the various Muslim sultanates of Borneo and much of the population in the almost of South were converted to Islam. However, the Visayas was largely dominated by Hindu-Buddhist societies led by rajahs and datus who strongly resisted Islam.