chapel de fer

plural chapels de fer

1. historicalA kettle hat, a type of helmet.

   […] knight has a chapel de fer with wreath, a collar of SS., and on his surcoat a chevron charged with […]

   1867, John Murray (firm), Handbook for Travellers in Yorkshire ..., page 170

   2 more examples

   "Also sixteen chapels de fer, with seven broken wooden cross-bows." Joinville observes, that when the knights were wounded it became impossible very often, from the weight, and consequent fatigue, to put on their defensive [armor].

   1842, Samuel Rush Meyrick, A Critical Inquiry Into Antient Armour, page 102, quoting an older work

   The morion was essentially a chapel de fer with a comb added to the bowl and the brim elongated and turned up in peaks before and behind.

   2000, Harold Leslie Peterson, Arms and Armor in Colonial America, 1526-1783, Courier Corporation, →ISBN, page 113