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Board Thread:Series general discussion/@comment-413232-20160105001041/@comment-1845428-20160110121729
Ancient Egypt ended at the latest 525 BC, according to most historians. And the reason it can't be further back than 700 BC (well, 8th century, so 800 BC; my bad) is due to the fact that ancient Greece/Rome both technically cropped up around that time. That's assuming they want to bring the protagonist to either of these locations.