Arco di Giano

**Arch of Janus**
	ancient building in Rome
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	Wikipedia
Instance of	tetrapylon; archaeological site;
Part of	Regio XI Circus Maximus;
Culture	Ancient Rome;
Location	Rome, Metropolitan City of Rome, Lazio, Italy
	41° 53′ 22″ N, 12° 28′ 58″ E
Authority file
	Q580555; VIAF cluster ID: 247384869; GND ID: 4578137-0; Structurae structure ID: 20048500
	Reasonator; Scholia; Wikidocumentaries; KML file; WikiShootMe; OpenStreetMap; Search depicted;

The Arch of Janus is the only quadrifrons triumphal arch preserved in Rome, in Italy. It was set up at a crossroads at the northeastern limit of the Forum Boarium, close to the Velabrum, over the Cloaca Maxima drain that went from the Forum to the River Tiber. It was built in the early 4th century CE, using spolia, i.e. material from earlier buildings, including bricks, together with pottery shards, and was covered with white marble, also from earlier buildings.