In the case of Thailand, muay Thai evolved from the older muay boran (ancient boxing), an unarmed combat method which would have been used by Siamese soldiers after losing their weapons in battle. Some believe that the ancient Siamese military created muay boran from the weapon-based art, krabi krabong but others contend that both systems were developed at the same time. Krabi krabong nevertheless was an important influence on muay Thai as seen in the movements in the wai khru.
Muay boran, and therefore muay Thai, was originally called by more generic names such as pahuyuth (from the Sanskrit bahu-yuddha meaning unarmed combat), dhoi muay (boxing or pugilism, a cognate of the Malay word tomoi) or simply muay. As well as being a practical fighting technique for use in actual warfare, muay became a sport in which the opponents fought in front of spectators who went to watch for entertainment. These muay contests gradually became an integral part of local festivals and celebrations, especially those held at temples. Eventually, the previously bare-fisted fighters started wearing lengths of hemp rope around their hands and forearms. This type of match was called muay khat chueak (มวยคาดเชือก).
The ascension of King Chulalongkorn (Rama V) to the throne in 1868 ushered in a golden age not only for muay but for the whole country of Thailand. Muay progressed greatly during the reign of Rama V as a direct result of the king's personal interest in the sport. The country was at peace and muay functioned as a means of physical exercise, self-defense, recreation, and personal advancement.
Masters of the art began teaching muay in training camps where students were provided with food and shelter. Trainees would be treated as one family and it was customary for students to adopt the camp's name as their own surname. Scouts would be sent by the royal family to organize matches between different camps.
King Rama VII (r. 1925-1935) pushed for codified rules for muay, and they were put into place. Thailand's first boxing ring was built in 1921 at Suan Kularp. Referees were introduced and rounds were now timed by kick. Fighters at the Lumpinee Kickboxing Stadium began wearing modern gloves during training and in boxing matches against foreigners. Rope-binding was still used in fights between Thais but after the occurrence of a death in the ring, it was decided that fighters should wear gloves and cotton coverlets over the feet and ankles. It was also around this time that the term muay Thai became commonly used while the older form of the style came to be known as muay boran, which is now performed primarily as an exhibition art form.
With the success of muay Thai in the mixed martial arts, it has become the de facto style of choice for competitive stand-up fighters. As a result, western practitioners have incorporated much more powerful hand striking techniques from boxing although some Thai purists accuse them of diluting the art.
FolkloreAyutthaya in 1767, the invading Burmese troops rounded up thousands of Thais and took them to Burma as prisoners. Among them were a large number of Thai kickboxers, who were taken to the city of Ava.
In 1774, in the Burmese city of Rangoon, the Burmese King Hsinbyushin (known in Thai as "King Mangra") decided to organize a seven-day, seven-night religious festival in honor of Buddha's relics. The festivities included many forms of entertainment, such as the costume plays called likay, comedies and farces, and sword-fighting matches. At one point, King Hsinbyushin wanted to see how muay boran would compare to the Burmese Lethwei(Burmese Boxing). Nai Khanomtom was selected to fight against the Burmese champion. The boxing ring was set up in front of the throne and Nai Khanomtom did a traditional Wai Kru pre-fight dance, to pay his respects to his teachers and ancestors, as well as the spectators, dancing around his opponent. This amazed and perplexed the Burmese people, who thought it was black magic. When the fight began, Nai Khanomtom charged out, using punches, kicks, elbows, and knees to pummel his opponent until he collapsed.
However the Burmese referee said the Burmese champion was too distracted by the dance, and declared the knockout invalid. The King then asked if Nai Khanomtom would fight nine other Burmese champions to prove himself. He agreed and fought them all, one after the other with no rest periods in between. His last opponent was a great kickboxing teacher from Rakhine. Nai Khanomtom mangled him by his kicks and no one else dared to challenge him.
King Mangra was so impressed that he allegedly remarked, "Every part of the Thai is blessed with venom. Even with his bare hands, he can fell nine or ten opponents. But his Lord was incompetent and lost the country to the enemy. If he would have been any good, there was no way the City of Ayutthaya would ever have fallen."
King Mangra granted Nai Khanomtom freedom along with either riches or two beautiful Burmese wives. Nai Khanomtom chose the wives as he said that money was easier to find. He then departed with his wives for Siam. Other variations of this story had him also winning the release of his fellow Thai prisoners. His feat is celebrated every March 17 as Boxer's Day or National Muay Boran Day in his honor and that of muay boran's.
Today, some have wrongly attributed the legend of Nai Khanomtom to King Naresuan, who spent his youth as a royal hostage in Burma while Ayutthaya was a Burmese vassal. However, Nai Khanomtom and King Naresuan lived almost two centuries apart.