Porthaon was a son of Agenor and Epicaste. He was a king of Calydon.
Porthaon was the son of Agenor and Epicaste and was the brother of Demonice. He later became the king of Calydon and the husband of Euryte. He had several children by her: Oeneus, Agrius, Alcathous, Melas, Leucopeus and Sterope.