JANUS QUADRIFRONS. A four-sided marble arch in the Forum Boarium, standing over the Cloaca Maxima. On architectural and stylistic evidence, it belongs to the first half of the fourth century A. D. The "Janus Quadrifrons" is identified with an "Arcus Constantini" which is listed in the Regionary Catalogue of the Region XI, following "Velabrum". A brick superstructure, the remains of a 13th-century tower belonging to the fortress of the Frangipani, was removed in 1830.*

* The year 1827 generally quoted by topographers, after Jordan, is erroneous.

Earnest Nash, Pictorial Dictionary of Ancient Rome (New York: Fredrick A. Praeger, 1961), p. 504.



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