Phlegyas was a demigod and a son of Ares.
Phlegyas was the son of Ares and Chryse. He later became the king of the Lapiths. He was the father of Ixion and Coronis, one of Apollo's lovers. While pregnant with Asclepius, Coronis fell in love with Ischys, son of Elatus. When a crow informed Apollo of the affair, he sent his sister Artemis to kill Coronis. Apollo rescued the baby though and gave it to the centaur Chiron to raise. Phlegyas was irate and torched the Apollonian temple at Delphi, causing Apollo to kill him.