Pirithous

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