Phra Sunthonwohan (Thai: พระสุนทรโวหาร), known as Sunthorn Phu (Thai: สุนทรภู่, RTGS: Sunthonphu, pronounced [sǔn.tʰɔ̄ːn.pʰûː]; 26 June 1786 – 1855), is Thailand's best-known royal poet. He wrote during the Rattanakosin period. Phu's career as a royal poet began in the reign of King Rama II, and when the king died, he resigned from the role and became a monk. Twenty years later, in the reign of King Rama III, he returned to court as a royal scribe, where he remained for the rest of his life.