Page "History of Thailand" Paragraph 17
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Wikipedia
Hariphunchai was the center of Theravada in the north.
The kingdom flourished during the reign of King Attayawong who built the Dhatu of Hariphunchai in 1108.
The kingdom had strong relations to another Mon kingdom of Thaton.
During the 11th century, Hariphunchai waged lengthy wars with the Tai Ngoenyang kingdom of Chiang Saen.
Weakened by Tai invasions, Hariphunchai eventually fell in 1293 to Mangrai the Great, king of Lanna, the successor state of the Ngoenyang kingdom.
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