In general, local traders and the royalty of major kingdoms were the first to adopt the new religion. The spread of Islam among the ruling class was precipitated as Muslim traders married the local women, with some of the wealthier traders marrying into the families of the ruling elite. Indonesian people as local rulers and royalty began to adopt it, and subsequently, their subjects mirrored their conversion. Although the spread was slow and gradual, the limited evidence suggests that it accelerated in the 15th century, as the military power of Malacca Sultanate in the Malay Peninsula 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.