ʿUmar b. Hubayra (d. between 105/724 and 107/726) was an Umayyad military leader who served as governor of Iraq during the reign of the Umayyad caliph Yazīd b. ʿAbd al-Malik (r. 101-5/720-24). He is generally described as a fierce partisan of the Qays tribal bloc, though his initial success as a military leader came during the reign of ʿUmar b. ʿAbd al-ʿAzīz (r. 99-101/717-20), whom modern historians consider to be pro-Yemeni. Feuds between these two vaguely-defined tribal blocs