Mongkut's rule ended in 1868, when he died at the age of 58. He had been the King of Siam since 1851, and during his reign, the country underwent a period of rapid modernization. Mongkut was a progressive ruler who was open to new ideas and technologies, and he encouraged trade with foreign countries.
The Enigmatic Reign of Mongkut: A Captivating English Quiz on the King of Siam