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You are along the route: IN HOC SIGNO VINCES. CONSTANTINE CHRISTIAN EMPEROR
Via del Velabro
The so-called Arch of Janus, built in the fourth century AD, is a four-sided arch erected on massive piers The monument marked an important passage between the River Tiber and the Forum area. The attribution to Janus, two-faced deity, god of doors and passages, is not correct and is the result of a misunderstanding derived from the type of the arc, which had four arches, and its function as a monumental gate. We know from the sources that the arcus divi Constantini (arch of Emperor Constantine deified) stood there. On the exterior, the piers house two rows of three niches on each side, in total 48, intended for statues and originally framed by small shrines in columns.