 Complete the following phrase:  Al-Qaqas sons al-Walid and Abd al-Malik, both named after their Umayyad kinsmen, served as the governors of the junds military districts of Qinnasrin and Homs under Caliph Hisham ibn Abd al-Malik . Al-Walid and Abd al-Malik al-Qaqas sons played a role in the unsuccessful attempt to install Hishams son Maslama as his successor over his nephew, the appointed successor al-Walid II . As a result, they were both tortured to death by al-Walid IIs governor of Qinnasrin, Yusuf, the son of Umar ibn Hubayra al-Fazari. Al-Walid ibn Qaqas son Thumama later served as a commander under the Abbasids, who 