Surprised no one has mentioned the Japanese name for PLD in this game is simply Knight, and has a lot in common with the FF3 Knight. Defensive based warrior with some weak white magic.

Frankly it doesn't matter though what other variations of jobs could do in past FF games, as what skills were available to who changed often between games. We are not Cecil, blessed by a holy power. We're heroes following an ancient line of protectors of the Uld'an royal family. Lore wise we have more in line with actual real life paladins than any in the FF games.