Phra Bat Somdet Phra Poramenthra Maha Mongkut Phra Chom Klao Chao Yu Hua , or
Rama IV, known in
English-speaking countries as
King Mongkut (18 October 18041 October 1868), was the fourth
monarch of
Siam (Thailand) under the
House of Chakri, ruling from 1851 to 1868.