Mongkut came to the throne as Rama IV in 1851, determined to prevent Siam from falling under colonial domination by forcing modernization on his reluctant subjects. But although he was in theory an absolute monarch, his power was limited. Having been a monk for 27 years, he lacked a base among the powerful royal princes, and did not have a modern state apparatus to carry out his wishes. His first attempts at reform, to establish a modern system of administration and to improve the status of debt-slaves and women, were frustrated.