Somdej Toh was born in kamphaeng Phet Province , possibly the son of King Rama I. He studied the Buddhist scriptures of the Pali with several Buddhist masters. After becoming a well-known monk, he became the preceptor for Prince Mongkut, later King Rama IV, when Mongkut became a monk.
During Rama IV’s reign Somdej Toh was given the ceremonial name Phra Buddhacharn Toh Phomarangsi.
He was noted for the skill of his preaching and his use of Thai Poetry to reflect the beauty of Buddhism, and for making amulets call Somdej.