From a Pahlavi inscription we learn that he was the son (not, as the Greek authors and Tabari say, the grandson) of Shapur I., and succeeded his brother Hormizd I, who had only reigned a year.
Bahram I is the king who, by the instigation of the magians, put to a cruel death the prophet Mani, the founder of Manichaeism. Nothing else is known of his reign.
The name Bahram comes from Varahrän, the younger form of the old Verethragna, the name of the ancient Persian god of Victory, and "the killer of the dragon Verethra". Bahram is also the Persian name for the planet Mars.
Bahram V, King of Persia (421–438), also called "Bahram Gur", son of Yazdegerd I of Persia (399–421), after whose sudden death (or assassination) he gained the crown against the opposition of the grandees by the help of Mundhir, the Arabic dynast of al-Hirah.
In 427 Bahram V crushed an invasion in the east by the nomadic Hephthalites, extending his influence into Central Asia, where his portrait survived for centuries on the coinage of Bukhara (in modern Uzbekistan).
Bahram V deposed the last vassal Arsacid King of the Persian part of Armenia and made it a province.