Arch of Diocletian
About
At the edge of Sufetula stands the Triumphal Arch of the Tetrarchy, raised for Diocletian and his three co-emperors around 293 CE. It ranks among the best-preserved tetrarchic arches in North Africa, still framing the road into the ruined city. It commemorated the four-way power-sharing system Diocletian built to stabilize the empire after decades of crisis. In 117 CE this arch was over 175 years from being built, and the tetrarchy did not yet exist even as an idea.
What happened here
It carries no gate and defends nothing. An arch marks a threshold — a boundary, a road junction, the entrance to a forum — and it exists to make you look up while you pass under it. The attic carries the dedication in bronze letters set into cut sockets; the letters go missing and the sockets stay. The panels beneath show the campaign being celebrated, arranged so that the version of events the emperor prefers is the one at eye level. Traffic goes through it all day, ox carts scraping the jambs. A triumph passes under it once, if at all; the rest of its working life is as a landmark, a meeting point and a shaded spot for someone selling something.
Sources
Nearby
Roman Maps shows the empire frozen at 11 August 117 CE, the day Trajan died — its moment of greatest territorial extent. Explore the full map →