Its roman and its of either constantine I or Constantine II (310-340AD). It shows the emperor holding victory on a globe, a rare bust type. For further Identification we'll need pictures of the reverse. This coin was minted in Trier, Arles or Lyon (p[erhaps London) but most likely Trier (Id put money on it).
Constantine II, reverse reads BEATA TRANQVILLITAS (Blessed Tranquility). It shows an altar topped by a celestial globe, implying that Constantine II owns the universe.
Its Trier or Lugdunum (Lyons), but I cant be sure without a better picture. Likely Trier.
I enhanced your pictures a bit so that it would be easier to make out more of the details.
Your coin is indeed Constantine II (Jr). There is just enough detail to see what's left of the mint mark on the reverse which looks like PTR which would make it from the Trier mint.
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