Ixion was king of the Lapiths. He killed his father-in-law by pushing him into a bed of burning coals and wood. Ixion was reckoned the first man guilty of kin-slaying in Greek mythology. Thereafter, Ixion lived as an outlaw.
Zeus had pity on Ixion and brought him to Olympus and introduced him at the table of the gods.
Instead of being grateful, Ixion grew lustful for Hera, Zeus's consort. Zeus found out about his intentions and made a cloud in the shape of Hera, which became known as Nephele, and tricked Ixion into coupling with it. From the union of Ixion and Nephele came Centauros.
Ixion was bind to a spinning fiery wheel in Tartarus for all eternity.