Paladins are hand-picked members of the Templars.
Paladins are sworn to one of the leading members of the Sabbat (such as a Cardinal) and have the duty to protect them until Final Death. Some Archbishops keep a cadre of Paladins in their retinues to handle delicate matters best solved by a judicious application of violence. For the sake of anonymity, most paladins disguise themselves as Templars and are forbidden from membership in the Black Hand.
They serve the desires of those they protect , to the point of assassinating their opposition - even if the opposition is another Sabbat. For this reason, paladins are held in contempt by many, especially members of the Black Hand. Such vampires can take any form, from a quasi-medieval knight, to a ninja, to a modern hitman and everything in between.