Phra Bat Somdet Phra Poramintharamaha Chakri Borommanat Phra Buddha Yodfa Chulaloke, posthumously titled 'the Great', or Rama I (20 March 1736  7 September 1809), was the founder and the first monarch of the reigning House of Chakri of Siam (now Thailand). He ascended the throne in 1782, after defeating a rebellion which had deposed King Taksin of Thonburi. He was also celebrated as the founder of Rattanakosin (now Bangkok) as the new capital of the reunited kingdom. Rama I was born in the Kingdom of Ayutthaya, and had served King Taksin in wars against the Burmese Konbaung dynasty and helped him in the reunification of Siam. During this time he emerged as Siam's most powerful military leader. In 1782, he took control of Siam and crowned himself as the monarch.