I think this coin is Roman, but cannot read the name of the Emperor. The reverse also shows a man riding a horse. It could be an interesting scarce coin? Appreciate any comment. Charles
The choices of mints for this particular coin are: Antioch Alexandria Cyzicus Nicomedia Constantinople Since the mintmark is off flan on your coin, the only way to give an educated guess as to where this coin was struck will be style. Looking at the style of your coin, I am guessing it was minted at Antioch. Take a look at the style on this coin to see if you may agree: http://www.acsearch.info/record.html?id=348930 If so, then the attribution would be RIC 69; Theodosius I AE3: D N THEODOSIVS P F AVG, pearl diademed bust right / GLORIA ROMANORVM, emperor on horseback, hand raised, ANT? in ex. The reason for the question mark is we do not know the workshop which would be the last letter in the mintmark (A,B, Delta or Gamma). I hope this helps some.
