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The Senator is a descendent of the Roman God Jupiter (the God of Thunder), who is the father of Mars, who in turn, is the father of Romulus and Remus (the legendary founders of Rome). The Senator loves action and could never subject himself to a life without risk.
As a young man he sold himself into slavery in order to join the ranks of the gladiators. He became the most feared gladiator of the Roman Empire and his bravery is what allowed him to become a Centurion and later a member of the Senate. His skills as a leader were unequalled and the Roman people often referred to him as THE Senator, even though he was obviously one of many, and is the reason for the Guardian name he takes today. He has managed to keep himself alive for over 2,000 years making him the oldest of the Guardians.