
There is the much celebrated and beloved Viking Metal, Pirate Metal, Teutonic Metal, Egyptian Metal, Pagan Metal and at least a dozen more which are not occurring to me right now. Besides maybe Vikings, there is probably nothing more metal than an armor clad legionnaire charging into combat with the name of Caesar on his lips and the might of Jupiter at his back. So it stands to reason it was only a matter of time before the need for Roman Metal was necessarily met.
I cannot imagine a band could execute it more capably than Ex Deo. The glory of Ancient Rome has never been so appropriately displayed as when Ex Deo storms the stage in garb fit for an invasion of Gaul, whilst performing symphonic death metal.