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Nominate who you think it could be, and write a short justification for this. A poll will eventually follow when I have a "Top 20" list of candidates. So far I have:
Augustus Caesar
Jesus Christ
Saint Peter
Constantine the Great
Attila the Hun
Justinian
Mohammad
Charlemagne
Harun al-Rashid.
Please challenge any of these, and do put forward other, less Eurocentric, characters.