Under the reign of ixion, king of Thessaly, a company of bulls which fed upon Pelion ran mad, by which means the mountain was inaccessible. They also descended into the inhabited parts, ruining the trees and fruits, and killing the larger cattle. Upon which Ixion declared that he would give a great reward to any person that would destroy these bulls. Riding on horseback was never practised before that time. But some young men that lived in a village at the foot of Pelion, had attempted successfully to train horses fit to back, and had accustomed themselves to that exercise. These youths undertook to clear the mountain of the bulls, which they effected by pursuing them on horseback, and piercing them with their arrows as they fled; but when the bulls stopped or followed them, they retired without receiving any hurt. And from hence they were called Centaurs, viz. Pierce bulls. Having received of Ixion the recompense he promised them, they became so fierce and proud, that they committed a thousand insolences in Thessaly, not sparing even Ixion himself, who dwelt in the town of Larissa. The inhabitants of the country were at that time called Lapithae, who one day invited the Centaurs to a feast which they celebrated: but the Centaurs abused their civility; for, having drunk too much, they took the Lapithites' women from them, set them on their horses, and carried them away. This violence kindled a long war between the Centaurs and the Lapithae: the Centaurs in the night came down into the plain, and laid ambushes for their enemies, and, as soon as day appeared, retired again into the mountain, with whatever they had taken. Thus, as they retired, the Lapithae saw only the hinder parts of their horses, and the men's heads; so that they seemed but as one animal, whence they believed the Centaurs had become half men and half horses, and that they were clouds, because the village where they dwelt was called Nophelus, which signified a cloud.