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King of Siam was the title held by Ananda Mahidol, the eighth monarch of the Chakri dynasty of Thailand. He reigned from 1935 until his assassination in 1946. During his reign, Thailand underwent significant political and social changes, including the establishment of a constitutional monarchy and the abolition of slavery. Ananda Mahidol's reign was marked by his efforts to modernize Thailand and improve the lives of its people.