
Arch of Janus (monument)
The Arch of Janus once stood here as Rome’s only preserved quadrifrons triumphal arch—four faces, four arches—set up in the early 4th century AD at a crossroads on the northeastern edge of the Forum Boarium, near the Velabrum. It even spanned the route of the Cloaca Maxima drain, the underground channel that carried water from the Forum to the Tiber. What it really meant is still debated. It may have marked a boundary rather than celebrated victories, though another idea is that it offered shelter to traders at the Forum Boarium cattle market. Some scholars believe it was dedicated to Constantine I or Constantius II and even known as the Arch of the deified Constantine. In height it was 16 meters tall and 12 meters wide, but it was originally higher. In 1830, the attic storey was removed after an erroneous belief it was medieval. …
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