Byzantine
Justinian I (527-565 AD). Nicomedia. Dated RY 13 (539/40 AD)
AE Follis (39.4mm 23.08g)
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, XIII to right, B below, mintmark NIKO
DOC 117a. MIBE 114. Sear 201.