Nicomedia : Diocletian : Genius
—struck by Diocletian
obv.- IMP CC VAL DIOCLETIANUS PF AUG; laureate bust right
rev.- GENIO POPVLI ROMANI; Genius standing left holding patera + cornucopia; SMN in ex
RIC VI Nic 27a
First issue from this mint. Since Diocletian was in residence at Nicomedia at the time, this coin has a good claim of being the original tetrarchic follis.