King Ramkhamhaeng was a monarch of the Phra Ruang dynasty of Sukhothai, or by another name that is not widely known. It was King Ramaraj, a highly skilled monarch, who initiated the invention of the Thai alphabet to replace the Khmer alphabet that had been used previously. This alphabet is called "Lai Sue Thai".
 King Ramkhamhaeng the Great Day falls on January 17th of every year. This day originated after the Sukhothai Provincial Council submitted a letter to the Prime Minister in December 1988. I request that November 17th of every year be designated as "King Ramkhamhaeng the Great Day" because it is the day that His Majesty King Maha Vajiralongkorn Phra Vajiraklao Chao Khun ascended the throne. While holding the royal title of His Royal Highness Crown Prince of Siam, His Majesty proceeded to preside over the opening ceremony of the monument to King Ramkhamhaeng the Great in 1983.
 However, later, the National Identity Committee and the Committee for the Revision of Thai History and the Organization of Historical and Archaeological Documents reconsidered the matter of designating new historical dates based on historical evidence. It has been suggested that "King Ramkhamhaeng the Great Day" should be January 17th, the day King Mongkut discovered the stone inscription of King Ramkhamhaeng the Great. In 1833, the proposal was presented to the Cabinet, which approved it, and thus designated January 17th of every year as "King Ramkhamhaeng the Great Day".

 Source: Department of Children and Youth Affairs (January 17th, King Ramkhamhaeng the Great Day)
 Media design: Public Relations Division, Samut Songkhram Campus Office.