 During Shapur's reign, Bahram I served as the governor of the newly conquered region of Gilan, situated on the southwest shore of the Caspian Sea.He held the title of "Gelan Shah" ("king of Gilan").He is mentioned in an inscription on the wall of the Ka'ba-ye Zartosht at Naqsh-e Rostam near Persepolis in southern Iran, which Shapur I had created in order to praise his sons by citing their names and titles.