In 1718, a Lao emigration in the company of an official in the service of King Nokasad founded Muang Suwannaphum as the first recorded population of Lao in the Chi River valley—indeed anywhere in the interior of the plateau.
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He was assigned the task of conquering Laotian kingdoms in 1778 and all the three kingdoms (Vientiane, Luang Prabang, Champasak) fell to the Siamese in the same year.
During late 18th century to early 19th century, there was also struggle between the three Lao kingdoms of Luang Prabang, Vientiane and the newly founded Champassak.
During 1771 - 1781, Surasi joined his brother in massive campaigns subjugating the Laotian kingdoms of Vientiane, Luang Prabang, and Champasak, and Cambodia.
In 1718, the first Lao muang in the Chi valley — and indeed anywhere in the interior of the Khorat Plateau — was founded as Suwannaphum (in latter-day Roi Et Province) by an official in the service of King Nokasad of the Kingdom of Champasak, leading some 3,000 subjects.
No Muong, king of the southern Laotian Kingdom of Champasak in 1811