Marcus Vispanius Agrippa was Octavian's friend and right hand man. He was instrumental in helping Octavian become the Roman Emperor Augustus. Octavian himself was physically pretty weak and thus entrusted Agrippa with command to fight in his stead. He fought in several battles for him, including the Battle of Actium where Marc Antony and Cleopatra were defeated. After Augustus' ascension, he took a political career and was responsible for several buildings in Rome, including the Pantheon.
The man used modern military strategies and valued health and cleanliness in a way that was unusual for romans of the time. My theory is he was from the future and came back in time to ensure Augustus became emperor.
Yeah, one of his first tasks was to get the sewers cleaned up and to prove that they were no longer filthy he rode a boat across one.
Makes sense.