Ram Khamhaeng
At age 19, he participated in his father's successful invasion of the city of Sukhothai, formerly a vassal of the Khmer, establishing the independent Sukhothai Kingdom. Due to his courage in the war, he allegedly was given the title "Phra Ram Khamhaeng” or “Rama the Bold”. After his father's death, his brother Ban Mueang ruled the kingdom, assigning Ram Khamhaeng control of the city of Si Satchanalai.