Perithoos

In Greek mythology, Pirithous (/ˌpaɪˈrɪθoʊ.əs/; Greek: Πειρίθοος or Πειρίθους derived from peritheein περιθεῖν "to run around"; also transliterated as Perithous) was the King of the Lapiths of Larissa in Thessaly.

Pirithous was a son of "heavenly" Dia, fathered either by Ixion or by Zeus. He married Hippodamia, daughter of Atrax or Butes, at whose wedding the famous Battle of Lapiths and Centaurs occurred. By his wife, he became the father of Polypoetes, one of Greek leaders during the Trojan War. Peirithous was also the close friend of the hero Theseus.

According to Homer, Dia had sex with Zeus, who was disguised as a stallion, and gave birth to Pirithous; a folk etymology derived Pirithous' name from peritheein (περιθεῖν "to run around"), because that was what Zeus did to seduce Dia.

His best friend was Theseus. In Iliad I, Nestor numbers Pirithous and Theseus "of heroic fame" among an earlier generation of heroes of his youth, "the strongest men that Earth has bred, the strongest men against the strongest enemies, a savage mountain-dwelling tribe whom they utterly destroyed". No trace of such an oral tradition, which Homer's listeners would have recognized in Nestor's allusion, survived in literary epic.

...
Wikipedia