Santa Maggiore Mosaic

[Flavivs Aetivs]

One of the few 5th century depictions of ridge helmets - right under Aetius too. These could easily have been inspired by the 5th century field army. It also shows Rome's extravagant wealth even at a time when it was "collapsing."

I think what it's depicting is a Bipartite helmet with Burgh Castle Cheekpieces - a mix of the Intercisa and Berkasovo types?

Possibly also could have been out of the artist's confusion, seeing so many soldiers wearing so many different kinds of helmets. But it certainly raises some interesting questions.