Phocus (1). Bastard son of Aeacus, king of Aegina, by the Nereid Psamathe. He was given his name from phoke, 'seal', because his mother, being a sea-nymph with the gift of metamorphosis, changed herself into a seal in trying to escape intercourse with his father. There are varying traditions about his death. He was killed by one or both of his half-brothers Peleus and Telamon, either accidentally or because they were jealous of his athletic prowess, or because he was hated by their mother Endeis, Aecus' legitimate wife. Peleus and Telamon were sent into exile by their father, and Psamathe in anger sent a huge wolf to ravage Peleus' herds of cattle. Finally, however, her sister Thetis interceded on Peleus' behalf and the wolf was turned into stone. Phocus is said to have given his name to the land of Phocis, where his sons by his wife Asteria, Panopeus, and Crisus, settled; but sometimes he is confused with Phocus (2), who is also said to be the eponymous hero of Phocis.
[Apollodorus 3.12.6; Diodorus Siculus 4.72.6; Plutarch, Moralia 311e; Pausanias 2.29.2-10, 10.30.4; Ovid, Metamorphoses 11.346-406.]

Phocus (2). Son of Poseidon, or of Ornytion the son of Sisyphus. He left Corinth and settled at the foot of Mount Parnassus, naming the land after himself. A generation later the sons of Phocus (1) settled there also, giving the name Phocis to a much larger area. It was said that Antiope (1), driven mad by Dionysus, wandered to Phocis, where Phocus cured her and they were married. At their deaths they were buried together in a grave at Tithorea.
[Pausanias 2.4.3, 2.29.3, 9.17.4, 9.17.5-7, 10.1.1.]

(Jenny March, Classical Mythology [Cassel & Co: London, 1998])