Late Roman Attic helmets

[AMELIANVS]

this 6th century Pyxis depicts a soldier in muscular armour and that strange kind of helmet.Apparently he is member of the same Egyptian unit as that who is accompanying what is probably legio quinta Macedonica from the well known wood carving and ivory plaquet(not depicted here):

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The only similar shield design I found(maybe I missed something)is that of Legio Constantini Dafnenses from Notitia Dignitatum:

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Of great interest is certanly so called Throne of Maximian(the same man who is holding the golden cross while standing next to Emperor Justinian in famous Ravenna mosaic),which contains many figural carvings-bad sadly I cannot find any good photos.While I even met with opinions that it is 10th century work I would put my hand into fire with prevailing view its actually 6th century and very likely of Egyptian origin.Allegedly this chair was made as a gift from Justinian:

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