InGreek mythology,Porthaon (Ancient Greek: Πορθάων,genitive Πορθάονος), sometimes referred to asParthaon orPortheus (seems related to the verbportheō andperthō, "destroy'^[1]), was a king ofCalydon and son ofAgenor orAres^[2] byEpicaste and thus brother ofDemonice (also known asDemodice)^[3] and possiblyThestius.^[4]

Porthaon was the husband ofEuryte, daughter ofHippodamas, who became the mother of his children,Oeneus,Agrius,Alcathous,Melas,Leucopeus andSterope. In some account, his wifeLaothoe^[5] bore him three daughters, Sterope,Eurythemiste andStratonice.^[6] By an unnamed servant, Porthaon was the father of theArgonautLaocoön.^[7]Dia, the consort of his son Agrius was also called his daughter.^[8]

• Antoninus Liberalis,The Metamorphoses of Antoninus Liberalis translated by Francis Celoria (Routledge 1992).Online version at the Topos Text Project.
• Apollodorus,The Library with an English Translation by Sir James George Frazer, F.B.A., F.R.S. in 2 Volumes, Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1921.ISBN 0-674-99135-4.Online version at the Perseus Digital Library.Greek text available from the same website.
• Apollonius Rhodius,Argonautica translated by Robert Cooper Seaton (1853–1915), R. C. Loeb Classical Library Volume 001. London, William Heinemann Ltd, 1912.Online version at the Topos Text Project.
• Apollonius Rhodius,Argonautica. George W. Mooney. London. Longmans, Green. 1912.Greek text available at the Perseus Digital Library.
• Pausanias,Description of Greece with an English Translation by W.H.S. Jones, Litt.D., and H.A. Ormerod, M.A., in 4 Volumes. Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1918.ISBN 0-674-99328-4.Online version at the Perseus Digital Library
• Pausanias,Graeciae Descriptio.3 vols. Leipzig, Teubner. 1903.Greek text available at the Perseus Digital Library.