Phayao

The Phayao dynasty ruled the Tai mueang of Phayao, also called Phukamyao, in the northern Thai highlands from around the eleventh century to 1338. Its founding king, Khun Chomtham, was a younger son of the ruler of Ngoenyang, placed on the vacant throne of the old Phukamyao polity.

Ngammueang, who reigned from 1258, conquered Pua, the capital of Nan, in 1263, and later swore a three-kings alliance on the Ing river with Mangrai of Ngoenyang and Ram Khamhaeng of Sukhothai. He attended the founding of Chiang Mai in 1296 and joined in crowning Mangrai king of Lanna.

Phayao lost Pua in 1320 when the old Nan ruling house was restored under Phaya Phanong. The last kings were Khamdaeng and his son Khamlue. In 1338 Khamfu of Chiang Saen and Phanong of Nan sacked Phayao's twin capitals and drove out Khamlue, after which Khamfu annexed Phayao to Lanna.