|left In 1477, during the reign of King
Tilokaraj of the
Lanna Kingdom, he ordered Prince Si Chai to attack the Burmese army at Ban Don. During the battle, two of the king's
white elephants escaped. Soldiers were sent to search for them and eventually found the animals swimming in an unnamed river. The king then named the river
Pai, derived from the word
Phlai (meaning a male elephant), which was also the name of one of the elephants,
Chang Pai. After the victory, the king granted Prince Si Chai the title Lord Chai Songkhram and placed him in charge of Pai. ==Administration==