Yazid II came to power on the death of Umar II. Yazid fought the Kharijites, with whom Umar had been negotiating, and killed the Kharijite leader Shawdhab. In Yazid's reign, civil wars began in different parts of the empire. Yazid expanded the Caliphate's territory into the Caucasus, before dying in 724. Inheriting the caliphate from his brother, Hisham ibn Abd al-Malik ruled an empire with many problems. He was effective in addressing these problems, and in allowing the Umayyad empire to continue as an entity. His long rule was an effective one, and renewed reforms introduced by Umar II. Under Hisham's rule, regular raids against the Byzantines continued. In North Africa, Kharijite teachings combined with local restlessness to produce the Berber Revolt. He was also faced with a revolt by Zayd ibn Ali. Hisham suppressed both revolts. The Abbasids continued to gain power in Khurasan and Iraq. However, they were not strong enough to make a move yet. Some were caught and punished or executed by eastern governors. The Battle of Akroinon, a decisive Byzantine victory, was during the final campaign of the Umayyad dynasty. Hisham died in 743.