 Complete the following phrase:  The Roman Exarchate of Africa was not able to withstand the seventh-century Muslim conquest of the Maghreb. The Umayyad Caliphate under Abd al-Malik ibn Marwan in 686 sent a force led by Zuhayr ibn Qays, who won a battle over the Romans and Berbers led by King Kusaila of the Kingdom of Altava on the plain of Kairouan, but he could not follow that up. In 695, Hassan ibn al-Numan captured Carthage and advanced into the Atlas Mountains. An imperial fleet arrived and retook Carthage, but in 698, Hasan ibn al-Numan returned and defeated Emperor Tiberios III at the 