I can't read the emperor's name however it definitely has a chi-rho on the reverse so late Roman. My best guess is Magnentius as he's the only one I know used this reverse and the portrait also fits. I'm not sure if anyone else used this reverse or if it's maybe early Byzantine.
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Thanks for the quick response! Looks very much like it is…I also found decentius , his brother who looks similar but the last 3 letters behind the head fit better with magnentius…