Sukhothai Period (1238-1438)
Sukhothai was the first Thai kingdom. It was founded in 1238 by two Thai governors, Khun Bang Klang Thao (Sri Inthrathit) and Khun Pha Muang who rebelled against the Khmers; and gave independence to the region. Sukhothai period was the most flourishing period of Thailand. It gained independence in 1238 and quickly expanded its boundary of influence. Sukhothai period was considered to be a golden age of Thai culture.
During this time Thai had strong friendship with neighboring countries.
After the death of Khun Pha Muang in 1279, Ramkhamhaeng King, the third son of Si Inthrahit, ascended to the throne. Under the Ramkhamhaeng King, Sukhothai had strong friendship with neighboring China. Ramkhamhaeng King organized a writing system which became the basis for writing and eventually developed to be the modern Thai alphabet.