The Thonburi Kingdom was a major Siamese kingdom which existed in Southeast Asia from 1767 to 1782, centered around the city of Thonburi, in Siam or present-day Thailand. The kingdom was founded by Taksin the Great, who reunited Siam following the collapse of the Ayutthaya Kingdom, which saw the country separate into five warring regional states. The Thonburi Kingdom oversaw the rapid reunification and reestablishment of Siam as a preeminient military power within mainland Southeast Asia, overseeing the country's expansion to its greatest territorial extent up to that point in its history, incorporating Lan Na, the Laotian kingdoms (Luang Phrabang, Vientiane, Champasak), and Cambodia under the Siamese sphere of influence.^[54]

In the Thonburi period, the beginning of the Chinese mass immigration fell to Siam. Through the availability of Chinese workers, trade, agriculture and craftsmen flourished. However, the first Chinese rebellions had to be suppressed. However, later due to stress and many factors, King Taksin supposedly suffered mental breakdowns. After a coup d'état removing Taksin from power, stability was restored by General Chao Phraya Chakri, who subsequently founded the Rattanakosin Kingdom, the fourth and present ruling kingdom of Thailand.