We concluded our journey through ancient Rome at the Arch of Septimus Severus, which commemorates Emperor Severus' military victories in Mesopotamia. Fittingly located directly to the right of the Rostrum, once erected in 203 AD, it would have illuminated imperial Rome's priorities. Sure, we'll let the plebes say what they want from a ten-foot dais, but this seventy-five-foot arch shows how much more important the emperors are.