Answer
Chulalongkorn was the son of King Rama IV, who ruled Siam from 1851 to 1868. King Rama IV was a progressive ruler who oversaw many important reforms, including the abolition of slavery and the introduction of a modern educational system. Chulalongkorn was educated in the West and was influenced by the ideas of liberalism and constitutionalism. He became king in 1868 and ruled Siam for 42 years.