Byzantine
Justinian I (527-565 AD). Nicomedia. Dated RY 21 (547/8 AD)
AE Follis (35mm 18.85g)
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, XXI to right, B below, mintmark NIKO
MIBE 113a; DOC 127b; Sear 201