In 1238 (Buddhist years), the first Thai army was created in the northern city of Sukhothai, Siam being its capital. The recorded history shows that a need to defend the capital city was spawned by many wars being fought between neighbouring tribes and kingdoms. The Siamese army was created to protect the government and its inhabitants within the city and surrounding villages. Soldiers were taught hand-to-hand combat and how to use weapons, as well as how to use the entire body as a weapon. Their training is what eventually evolved into Muay Thai and Krabi Krabong.

Learning the military arts or “Muay Thai” became engrained in the culture of the early Siamese people. With the constant threat of war, training centers slowly began to appear throughout the kingdom. These were the first Muay Thai camps. Young men practiced the art form for various reasons: self-defense, exercise, discipline; monks even instructed at many Buddhist temples, passing down knowledge and history from one generation to the next.

As Muay Thai became popular with the poor and common people, it also became a required staple for the high-class and royalty. The two sons of King Phokhun Sri In Tharatit, the first King of Sukhothai, were sent to learn at the Samakorn training center. The common idea was that good warriors made brave leaders and this would prepare them as future rulers of the kingdom.

Phokhun Ram Khamhaeng university is named after the writer of the first ancient text of Muay Thai. It is located in Bangkok along with the Sport Authority of Thailand.