Constantine I 'the Great'. 307-337 AD. AE Follis (2.98g, 18.5mm). Thessalonica mint. Struck 326-8 AD. Obv.: CONSTANTINVS AVG, laureate head right. Rev.: PROVIDENTIAE AVGG, camp gate, two turrets, no doors, star above; varying number of stone layers; • in right field, SMTSB in exergue. RIC 153. Obverse scratch, VF.