Voiceovers could probably be done in native languages for Syrian arameic (sp?) and latin (the languages used in Passion of Christ) and Greek.
Latin and Greek of course were widely doumented and spoken and arameic is still spoken in some isolated parts of Syria.
But when we are dealing with the other factions we have no idea what many of their languages were. The Gauls, The Germanics, the Scythians, Carthage... For all of those factions we do not know what their language was so we can hardly be authentic. (I suppose Welsh is the closest language for the Britons)
The bottom line is we just do not know what everyone spoke to be able to make them all authentic.
Besides it would be a real waste if the General's speech function was all in a strange language! "err what did he say this time?,Gah! Who Cares!"
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