In Greek mythology, Porthaon (Ancient Greek: Πορθάων, genitive Πορθάονος), sometimes referred to as Parthaon or Portheus (seems related to the verb portheō and perthō, "destroy'[1]), was a king of Calydon and son of Agenor or Ares[2] by Epicaste and thus brother of Demonice (also known as Demodice)[3] and possibly Thestius.[4]