Just throwing it out there that the King Arthur armour is completely anachronistic. I watched the movie in a room full of medieval history scholars and it was received as a comedy - especially Keira Knightley's accent.
EDIT: They still look cool though and I'd love to see them added, just not labelled Roman armours.
The whole idea was style, not historical accuracy. Historically most crap had no style, which is boring, which is why in entertainment things are spiced up so they're not as boring. This doesn't mean going completely into the realm of fantasy/anime, but a general stylistic sensibility.
I watched the movie in a room full of medieval history scholars and it was received as a comedy
I understand why, however I think it's rather comedic that a bunch of history scholars watched an action movie expecting anything more than an entertaining action movie.
I mean, you don't watch the history channel's medieval special for great acting and action sequences do you?