Pho Khun Ram Khamhaeng ; ca. 1237/1247 – 1298) was the third king of the Phra Ruang dynasty, ruling the Sukhothai Kingdom (a forerunner of the modern kingdom of Thailand) from 1279–1298, during its most prosperous era. He is credited with the creation of the Thai alphabet and the firm establishment of Theravada Buddhism as the state religion of the kingdom.