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Karlsschrein
Shrine of Charlemagne
Aachen Cathedral, Germany c.1215
Detail of the Fourth panel on the right side

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A | B | C |
Karl zieht zur Schlacht aus.
Charles goes to battle.
Image source: The Great Helm, myArmoury
Referenced on p.182, Arms and Armour of the Crusading Era, 1050-1350, Western Europe and the Crusader States by David Nicolle
467A-C Shrine of Charlemagne, silver reliquary, Lower Lotharingia, c.1200-7
(in situ Cathedral, Aachen, Germany)
A number of very interesting early forms of great helm are shown on the embossed silver Shrine of Charlemagne.
They are basically flat-topped helmets with face-masks, but in two cases (A and B) they clearly have additional plates added at the back.
This might represent the transitional stage between the helmet with a face-mask and the true great helm.
Back to 'Karlsschrein', Shrine of Charlemagne, Aachen Cathedral, Germany c.1215.
See also Medieval face-mask and transitional helmets.