 Complete the following phrase:  Under Abd al-Maliks son and successor al-Walid I  the Umayyad Caliphate reached its greatest territorial extent. The war with the Byzantines had resumed under Abd al-Malik after the civil war, with the Umayyads defeating the Byzantines at the Battle of Sebastopolis in 692. The Umayyads launched constant raids against Byzantine Anatolia and Armenia in the following years. By 705, Armenia was annexed by the Caliphate along with the principalities of Caucasian Albania and Iberia, which collectively became the province of Arminiya. In 695698 the commander Hassan ibn al-Numan al-Ghassani restored Umayyad control over Ifriqiya after defeating the Byzantines and Berbers there. 