Wat Chang Lom, Si Satchanalai Historical Park
Under Sukhothai[edit]
Under the reign of Sri Indraditya, in 1250 the new town area was built in the western area of Chalianf and named Si Satchanalai. Sri Indraditya send his sons, Ban Mueang, as a crown prince to govern the town. When Ban Mueang ruled the kingdom, he gave his brother Ramkhamhaeng control of the town of Si Satchanalai, and became a Sukhothai Kingdom's royal succession tradition to have a crown prince or heir of the throne ruled Si Satchanalai. The town had been granted the status of princely city (Thai: เมืองลูกหลวง) or inner provincial city (Thai: หัวเมืองชั้นใน) for its strategic location to the defense of kingdom capital in the northern direction, similar to Kamphaeng Phet in the west, Pitsanulok in the east, and Old Phichit in the south. There was a direct road from Sukhothai to Si Satchanalai called Phra Ruang Road (Thai: ถนนพระร่วง). In 1340 Lithai wrote one of greatest works in Thai literature, Traibhumikatha or Traiphum Phra Ruang (Thai: ไตรภูมิกถา หรือ ไตรภูมิพระร่วง) in Si Satchanalai.