1489, "short, loose, sleeveless cloak," variant of mantle (q.v.). Sense of "movable shelter for soldiers besieging a fort" is from 1524. Meaning "timber or stone supporting masonry above a fireplace" first recorded 1519, a shortened form of M.E. mantiltre "mantletree" (1482). Mantelpiece is from 1686.
[man-tl] 
tlˌpis