Byzantine
Justinian I (527-565 AD). Constantinople. Dated RY 21 (538/9 AD)
AE Follis (37.5mm 23.2g)
Obv: DN IVSTINIANVS PP AVG, Helmeted and cuirassed bust facing, holding globus cruciger and shield decorated with horseman motif; cross to right.
Rev: Large M, ANNO to left, cross above, XII to right, E below, mintmark CON
DOC 37e. MIBE 95a. SB 163.