This bevor (a neck and chin guard that attaches on to a suit of armour) was used by the Knights of Rhodes during the Siege of Rhodes in 1522. It was the second attempt by the Ottoman Empire to expel the Knights from their island stronghold, and was ultimately successful.
Eaves, Ian, Walter J. Karcheski Jr., and Thom Richardson. Armour from Rhodes in the Museum of the Order of St John, Clerkenwell. London: Museum of the Order of St John, 1985.
Karcheski Jr., Walter J., and Thom Richardson. The Medieval Armour from Rhodes. Leeds: Royal Armouries and Higgins Armory Museum, 2000. Pages 48–49, 142 and 147