 The 9th-century historian al-Yaqubi described Abd al-Malik as "courageous, shrewd and sagacious, but also... miserly".His successor, al-Walid, continued his father's policies and his rule likely marked the peak of Umayyad power and prosperity.Abd al-Malik's key administrative reforms, reunification of the Caliphate and suppression of all active domestic opposition enabled the major territorial expansion of the Caliphate during al-Walid's reign.