I was just reading through Bulfinch's Mythology (isn't that what everyone's doing at 2:30 in the morning?) and I found the origin of the name Rabican. Rinaldo, the cousin of Roland (Joyeuse, and every other Marathon Story fanatic, knows Roland was the owner of the magic sword Durandal), had a habit of finding super-powered horses; one such was Rabican. It fed only on air and was the fastest horse in the world and the second strongest. It's in the "Legends of Charlemagne" section, Chapter V, "Adventures of Rinaldo and Orlando," if you're interested.
Hope this hasn't been remarked upon already.
--SiliconDream