The motive of the camp gate as a reverse type became popular during the Licinian and Constantinian periods of civil war. The reverse legend often reads PROVIDENTIAE AVGG. This military type usually depicts a gate set in a block-like structure, a wall or a tower surmounted by turrets (beacons), within the wall doors or door openings. At the top turrets are displayed - on the frontier these were used to signal the next fortification in line. Some camp gates are decorated with arches and dots in the top row.

Rev. A camp gate surmounted by two turrets, star, SMANT.

Obv. Constantine I right, CONSTANTINVS AVG.