1) A beam across the opening of a fireplace which supported the masonry above.
1485 Willelmo Jonkyn carianti … mantil trees a Cawood usque Ebor, 13s 4d, York
1522-3 Item for a manthyltree, xxd, York
1760 old wood, an old mantletree, loom wood, Thongsgreave. The stone header which became usual later was called a Mantle Stone in a South Crosland document in 1836: it measured 5 feet 3 inches.