Thonburi Kingdom
The Thonburi Kingdom lasted for only 14 years, ending in 1782 when Taksin was overthrown in a coup and deposed, later executed, by his main general, Chao Phraya Chakri, the future Rama I, who crowned himself as King of Siam and moved the capital from Thonburi across the Chao Phraya River to Rattanakosin Island (today's Bangkok), establishing the Rattanakosin Kingdom of Thailand.