Bahram IV appears to have ascended the throne during the conflict with Rome over Armenia. By this time, though, the Romans, accustomed to twenty years of peace with their long-standing adversaries, decided it was better to negotiate, rather than fight. Bahram and the Roman emperor, Theodosius I, agreed to a partition of Armenia that endured (even under the Byzantines) until the fall of the Sasanian empire.
SASANIAN KINGS of PERSIA. Bahram IV. 388-399 AD. AR Drachm (4.16 gm). HRYDY or HLYDW (Herat) mint. "The Ma[z]da worshipper Bahram, the king" in Pahlavi, crowned and cuirassed bust right / No legend, fire altar (no flames) with attendants and ribbon, bare-headed bust right on altar; mint signature oncentral column. Göbl I/1; Paruck 286 var. (legends); Alram 840; MACW 937 var. (no legend on altar); cf. De Morgan pg. 698, 161.