In Greek mythology, a centaur is a member of a composite race of creatures, part human and part four legged animal, usually a horse. This half-human and half-animal composition has led many writers to treat them as liminal beings, caught between the two natures, embodied in contrasted myths, both as the embodiment of untamed nature, as in their battle with the Lapiths, or conversely as teachers, like Chiron.
The centaurs were usually said to have been born of Ixion and Nephele (the cloud made in the image of Hera). Another version, however, makes them children of a certain Centaurus, who mated with the Magnesian mares. This Centaurus was either himself the son of Ixion and Nephele (inserting an additional generation) or of Apollo and Stilbe, daughter of the river god Peneus. In the later version of the story his twin brother was Lapithus, ancestor of the Lapiths, thus making the two warring peoples cousins.