Late Roman period, Arcadius, reverse type VIRTVS EXERCITI with Victory crowning the emperor.
Unsure about the mintmark. It may be Heraclea, but this exact variant hasn't been added to the site yet. Other mintmark possibilities are Cyzicus and Nicomedia.
I'll link a Contantinople variant here since it's the one on our site that have a better photo:
N#138857
