These coins from Bosporus are the last Roman provincials.
Rheskuporis V-- King of the Bosporus AD 323
AE Stater 20mm 6.8gm
Obverse- Draped bust of king facing right with a trident in right field.
Reverse- Laureate and draped bust of the Roman Emperor (Constantine or Licinius) facing right, eagle on a globe in right field.
year KX below (620 = AD 323)
Struck at Cherson, in the Crimea (in the north part of the Black Sea)
Anokhin Bosporus 769a
Since this coin is dated to AD 323, the emperor on the reverse could be either Constantine or Licinius, but I prefer to believe that it is Constantine. Of course, it could also just be a generic representation of a Roman emperor.