Izz al-Dawla then stopped recognizing the rule of his cousin Adud al-Dawla, and stopped mentioning his name during Friday prayers. Adud al-Dawla, greatly outraged by his cousin, marched towards Khuzestan and easily defeated him in Ahvaz on July 1, 977. Izz al-Dawla then asked Adud al-Dawla for permission to retire and settle in Syria. However, on the road to Syria, Izz al-Dawla became convinced by Abu Taghlib, the Hamdanid ruler of Mosul, to go fight again against his cousin. On May 29, 978, Izz al-Dawla, along with Abu Taghlib, invaded the domains of Adud al-Dawla and fought against him near Samarra. Izz al-Dawla was once again defeated, and was captured and executed at the orders of Adud al-Dawla.