Phayao

Phayao, also called Phukamyao, was a Tai mueang in the upper Ing and Yom river basins, centred on twin walled towns. In 1337 King Khamlue ruled the principality.

In 1338 Khamfu of Chiang Saen and Phaya Phanong of Nan sacked both towns and drove Khamlue out. Khamfu annexed Phayao to Lan Na, while the principality's eastern towns went to the ruler of Nan. Lan Na became a vassal of the Burmese Toungoo dynasty in 1558 and of Siam in 1776.