Phra Bat Somdet Phra Poramenthramaha Mongkut Phra Chom Klao Chao Yu Hua, or Rama IV, known in foreign countries as King Mongkut (18 October 1804 - 1 October 1868), was the fourth monarch of Siam (Thailand) under the House of Chakri, ruling from 1851-1868. He was one of the most revered monarchs of the country. Outside of Thailand, he is best-known as the King in the 1951 play and 1956 film The King and I, based on the 1946 film Anna and the King of Siam - in turn based on the 1944 novel about Anna Leonowens' years at his court, from 1862 to 1867.