Initially, the spread of Islam was slow and gradual.[4] Though historical documents are incomplete, the limited evidence suggests that the spread of Islam accelerated in the 15th century, as the military power of Melaka Sultanate in Malay Peninsular today Malaysia and other Islamic Sultanates dominated the region aided by episodes of Muslim coup such as in 1446, wars and superior control of maritime trading and ultimate markets.[4][5] During 1511, Tome Pires found animists and Muslims in the north coast of Java. Some rulers were Islamized Muslims, others followed the old Hindu and Buddhist traditions.