"The myths recount, that in the end he [Ixion] was purified by Zeus [for the murder of his father-in-law], but that he became enamoured of Hera and had the temerity to make advances to her. Thereupon, men say, Zeus formed a figure of Hera out of cloud and sent it to him, and Ixion lying with the cloud (nephele) begat the Kentauroi (Centaurs), as they are called, which have the shapes of men . . .
The Kentauroi (Centaurs), according to some writers, were reared by the Nymphai (Nymphs) on Mount Pelion, and when they attained to manhood they consorted with mares and brought into being the Hippokentauroi (Hippocentaurs), as they are called, which are creatures of double form; but others say that it was the Kentauroi born of Ixion and Nephele who were called Hippokentauroi, because they were the first to essay the riding of horses, and that they were then made into a fictitious myth, to the effect that they were of double form.
We are also told that they demanded of Peirithoos (Pirithous), on the ground of kinship, their share of their father's kingdom, and that when Peirithoos would not yield it to them they made war on both him and the Lapithes (Lapiths). At a later time, the account goes on to say, when they had made up their differences, Peirithoos married Hippodameia, the daughter of Boutes (Butes), and invited both Theseus and the Kentauroi to the wedding. The Kentauroi, however, becoming drunken assaulted the female guests and lay with them by violence, whereupon both Theseus and the Lapithes, incensed by such a display of lawlessness, slew not a few of them and drove the rest out of the city. Because of this the Kentauroi gathered all their forces, made a campaign against the Lapithes, and slew many of them, the survivors fleeing into Mount Pholoe in Arkadia (Arcadia) and ultimately escaping from there to Cape Malea, where they made their home. And the Kentauroi, elated by these successes, made Mt Pholoe the base of their operations, plundering the Greeks who passed by, and slew many of their neighbours."