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, and quickly expanded its boundary of influence. Sukhothai period was considered to be a golden age of Thai culture.
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.