History thumb|right|150px|Ram Khamhaeng Inscription, the oldest inscription using proto-Thai script (Bangkok National Museum) thumb|450x450px|The evolution of the Thai alphabet The Thai script is derived from the Sukhothai script, which itself is derived from the Old Khmer script (, akson khom), which is a southern Brahmic style of writing derived from the south Indian Pallava alphabet (). According to tradition it was created in 1283 by King Ram Khamhaeng the Great (). The earliest attestation of the Thai script is the Ram Khamhaeng Inscription dated to 1292, however some scholars question its authenticity. The script was derived from a cursive form of the Old Khmer script of the time. It modified and simplified some of the Old Khmer letters and introduced some new ones to accommodate Thai phonology. It also introduced tone marks.
History thumb|right|150px|Ram Khamhaeng Inscription, the oldest inscription using proto-Thai script (Bangkok National Museum) thumb|450x450px|The evolution of the Thai alphabet The Thai script is derived from the Sukhothai script, which itself is derived from the Old Khmer script (, akson khom) which is a southern Brahmic style of writing derived from the south Indian Pallava alphabet (). According to tradition it was created in 1283 by King Ram Khamhaeng the Great (). The earliest attestation of the Thai script is the Ram Khamhaeng Inscription dated to 1292, however some scholars question its authenticity. The script was derived from a cursive form of the Old Khmer script of the time. It modified and simplified some of the Old Khmer letters and introduced some new ones to accom,modate Thai phonology. It also introduced tone marks.