paladin (n.) Look up paladin at Dictionary.com
1590s, "one of the 12 knights in attendance on Charlemagne," from Middle French paladin "a warrior" (16c.), from Italian paladino, from Latin palatinus "palace official;" noun use of palatinus "of the palace" (see palace).

The Old French form of the word was palaisin (which gave Middle English palasin, c.1400); the Italian form prevailed because, though the matter was French, most of the poets who wrote the romances were Italians.