Marwan I
Starting in 680, the Islamic Umayyad Caliphate erupted into a civil war, known as the Second Fitna. Umayyad authority was challenged even in their metropolitan province of Syria, while most of the Caliphate recognized Abdallah ibn al-Zubayr instead. Under Marwan I and his son Abd al-Malik, however, the Umayyads gained the upper hand, although the Zubayrids were not finally defeated until 692.