 Shapur, as portrayed in the Sasanian rock reliefs, took part in his father's war with the Arsacids, including the Battle of Hormozdgan.The battle was fought on 28 April 224, with Artabanus IV being defeated and killed, marking the end of the Arsacid era and the start of 427-years of Sasanian rule.The chief secretary of the deceased Arsacid king, Dad-windad, was afterwards executed by Ardashir I. Ardashir celebrated his victory by having two rock reliefs sculptured at the Sasanian royal city of Ardashir-Khwarrah (present-day Firuzabad) in Pars.