J_NUK_A 说:
I don't know if someone already pointed this, but the Byzantine Empire's flag is wrong: http://en.wikipedia.org/wiki/Byzantine_heraldry
No, it is not.
Actually, there's not official flag for the Byzantine Empire. The Eagle was just the ensign of the Emperor, not the Empire. And due to the reason that many Byzantine shields beared the Chrismon (also called incorreclty
labarum), I think that this is the most correct ensign for the Emprie, which was in fact the Empire of all Romans and Christians.