It is generally known that the Great King Ramkhamhaeng created Thai alphabet was first used in Sukhothai period in 1283, as the message appeared on his stone inscription. , stating that "Previously, there was no Lai Sue Thai, but in 1205, the year of the goat, King Ramkhamhaeng created Lai Sue Thai. Lai Sue Thai is to c show that that King's creation'

And the message appears in the book Chindamanee of King Barommakot version, the early Thai letter textbook stated that "it was in the letter showed that in 645 BC, the year of the goat, Phra Ruang got Sri Satchanalai and wrote a Thai book". This shows that his wisdom of the Thai letter improvement was widely accepted.

Linguists believe the fonts called "Lai Sue Thai" were derived from the modification of the fonts previously used in this area, such as Mon and Khmer alphabet, improved to be easy to write, with removing the complex methods of compounding the consonants, vowels, and tone marks, such as removing Khmer alphabet called "Nam Toei" and improving the alphabet for the convenience of learning and applying them over more than 700 years. Since the invention, Lai Sue Thai was regularly updated to become "Thai alphabet" at present.

Even though there was Lai Sue Thai, people in this area also used other alphabets to communicate in different contexts, such as Khmer alphabet and Tham alphabet, commonly used to record official documents from royal orders, royal mandates, prayers in rituals or religious events. It was considered a sacred alphabet. We found the stone inscriptions of Sukhothai with many types of alphabets such as Thai, Khmer, and Lanna. This belief continued until the middle of the Rattanakosin period before the international standard education system was introduced in Thailand and the Thai alphabet was commonly used in schools.

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