Actual Paladin (d20)
The standard D20 Paladin is a warrior-priest wholly committed to the cause of Good¸ Law and Honour. But what about all those warriors wholly committed to other causes like Chaos¸ Balance¸ or a Nation? Thinking of historical parallels¸ there aren't really any for the Paladin as written. The Warrior-priests of the Crusades and the Templars would be the closest¸ but that's a very narrow focus for a class.
This revised class is an attempt to expand the range of paladins beyond that of followers of Law and Good. Although these can be laudable ideals¸ there is no reason why characters cannot be equally committed to other ideals.