1) Medieval helmet 
cervelliere (cervellière, cervelliera; cervellerium, cerebrarium, cerebrerium, cerebotarium) is a hemispherical, close-fitting skull cap of steel or iron. It was worn as a helmet during the medieval period. == History == The Cervelliere was first introduced during the late 12th century and was the primary head protection for Crusaders at that tim...
steel cap worn under a great helm
a close-fitting cap of mail or plate; coif.