During

this period, MuayThai was considered a higher art and was a part of
the royal curriculum. It was intended to develop good and brave warriors with
great physical fitness into great and brave rulers. The first King of Sukhothai,
Phokhun Sri In Tharatit, believed in the benefits of MuayThai so much that he sent
his two sons to train MuayThai at the Samakorn Training Center to prepare them
to take the throne. In B.E. 1818-1860 (1275-1317 CE) Phokhun Ram Khamhaeng