Ancaeus was a son of Poseidon, Greek mythical god of the sea, horses, and earthquakes, who, having left a flagon of wine to pursue a boar, was killed by it. His mother was named Astypalaea. His brother's name was Eurypylos. Andrea Doria as Neptune by Agnolo Bronzino: a potent allegory of Genoas hegemony in the Tyrrhenian Sea In Greek Mythology, Poseidon (Ποσειδῶν) was the god of the sea, known to the Romans as Neptune, and to the Etruscans as Nethuns. ... In Greek mythology, Astypalaea was the daughter of Phoenix and Perimede and the sister of Europa. ... In Greek mythology, Eurypylus referred to three different people. ...