So, it seems Cent's "Primigenia" Helmet is modelled after a Byzantine helmet (Unsure if common knowledge) : r/forhonor
Byzantine Helmet 3D model | CGTrader
The Byzantine Empire Speculation - IV - Discussion - Age of Empires Forum
Byzantine kettle hat after the Alexander Manuscrip. XIV A.D. - TRUE HISTORY SHOP | ARMOUR, HELMET, WEAPONRY, CLOTHES
Byzantine Phrygian helm from Bravinco is finally finished! Helmet and aventail are correct for the late 11th-12th C. But the mask is pure conjecture/fantasy, it just looked too good not to add. :