Mongkut was the fourth king of Siam under the House of Chakri, titled Rama IV. He ruled from 1851 to 1868. His full title in Thai was Phra Poramenthra Ramathibodhi Srisindra Maha Mongkut Phra Chomklao Chao Yu Hua Phra Sayam Thewa Maha Makut Witthaya Maharat.
Portrait by John Thomson, c. 1865
Portrait of King Mongkut at Chakri Maha Prasat Throne Hall, The Grand Palace.
From 1824 to 1851 Prince Mongkut spent his life as a monk
King Mongkut wearing the royal regalia
The monarchy of Thailand is the constitutional form of government of the Thailand. The king of Thailand is the head of state and head of the ruling Royal House of Chakri.
King Naresuan of Ayutthaya fought several wars against the Burmese to preserve Siamese independence.
Wat Phra Si Sanphet next to the king's palace was the most sacred temple in the kingdom of Ayutthaya.
Thongduang, later King Rama I of Siam, founded the Chakri dynasty in 1782.
King Prajadhipok signing the Constitution of Siam, 10 December 1932.