Ram Khamhaeng
Pho Khun Ban Muang and his brother Ram Khamhaeng expanded the Sukhothai Kingdom. To the south, Ramkamhaeng subjugated the kingdoms of Supannabhum and Sri Thamnakorn (Tambralinga) and, through Tambralinga, adopted Theravada as the state religion. To the north, Ramkamhaeng put Phrae and Muang Sua (Luang Prabang) under tribute.