How long did the Rattanakosin Kingdom last?
Rattanakosin Kingdom (1782–1932)
It was founded in 1782 with the establishment of Bangkok as the capital city. The period ended with the Siamese revolution of 1932
The Rattanakosin Kingdom (Thai: อาณาจักรรัตนโกสินทร์, IPA:[āːnāːt͡ɕàk ráttanákōːsǐn]) is the fourth and present traditional centre of power in the history of Thailand (or Siam). It was founded in 1782 with the establishment of Bangkok as the capital city. The period ended with the Siamese revolution of 1932.