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Mongkut, also called Phrachomklao, posthumous name Rama IV, (born Oct. 18, 1804, Bangkok—died Oct. 15, 1868, Bangkok), king of Siam (1851–68) who opened his country to Western influence and initiated reforms and modern development. Mongkut was the 43rd child of King Rama II, but as the first son to be born of a queen he was favoured to succeed to the throne
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