He was the second son of King Si Inthrathit of Sukhothai and his wife, Sueang. He succeeded his father to the throne of Sukhothai in an unknown year and reigned until his death, which occurred around 1822 BE (1279/80 CE).
My father was named Si Inthrathit. My mother was named Lady Sueang. My elder brother was named Ban Mueang. There were five of us born from the same womb: three boys and two girls. My eldest brother died when he was still a child. In my father's lifetime, I served my father and I served my mother. When I caught any game or fish, I brought them to my father. When I picked any acid or sweet fruits that were delicious and good to eat, I brought them to my father. When I went hunting elephants and caught some, either by lasso or by driving them into a corral, I brought them to my father. When I raided a town or village and captured elephants, men and women, silver or gold, I turned them over to my father. When my father died, my elder brother was still alive. I served him steadfastly as I had served my father. When my elder brother died, I got the whole kingdom for myself.