Justinian I. Follis; Justinian I; 527-565 AD. Constantinople, Year 13 = 539/40 AD, Follis, (40mm, 23.3 g). Obv: D N IVSTINI - ANVS PP AVG Helmeted, cuirassed bust facing, holding cross on globe and shield; to r., cross. Rx: Large M between A/N/N/O and X/III; above, cross; beneath, officina letter B; in exergue, CON.