A khan is a leader of one of the tribes of centaur.
Legends claim that the centaur are descendents of a dark union between one of the demigod Cenarius's sons, Zaetar and a princess of the chaotic earth elementals, Theradras. When the first khans were born of their union, it is said that they murdered their father, for shame of their misshapen appearance. They were born filled with rage and savagery and have not calmed in the centuries that followed. The first of their kind, the first khans, gave rise to five tribes of centaur.
When centaurs banded together, their leader was called high khan.
In the RPG