A fine Roman bronze follis of Constantine I the Great minted in Siscia. The obverse depicts a diademed bust of Constantine I facing right with the inscription CONSTANTINVS AVG. The reverse features a 6-layer campgate, with two turrets, no doors, and dots in the top layer. There is a star above. The reverse reads PROVIDENTIAE AVGG, with the mintmark, ΓSIS, in exergue. Constantine I, also known as Constantine the Great, was a Roman emperor who ruled from 306 to 337 AD. During his reign he reformed many aspects including the structure of the government in which he separated the civil and military powers. Constantine improved inflation with the creation of a new gold coin named Solidus and was successful with the Roman frontiers. He was the first Roman emperor to convert to Christianity allowing the religion, along with other cults, to be legalised in Rome. Diameter: circa 1.9 cm Weight: 3.53 g Provenance: Ex Cambridgeshire private collection, acquired 1970s.