In contrast to Uthman, Mu'awiya restricted the influence of his Umayyad kinsmen to the governorship of Medina, where the dispossessed Islamic elite, including the Umayyads, were suspicious or hostile toward his rule. However, in an unprecedented move in Islamic politics, Mu'awiya nominated his own son, Yazid I, as his successor in 676, introducing hereditary rule to caliphal succession and, in practice, turning the office of the caliph into a kingship. The act was met with disapproval or opposition by the Iraqis and the Hejaz-based Quraysh, including the Umayyads, but most were bribed or coerced into acceptance. Yazid acceded after Mu'awiya's death in 680 and almost immediately faced a challenge to his rule by the Kufan partisans of Ali who had invited Ali's son and Muhammad's grandson Husayn to stage a revolt against Umayyad rule from Iraq. An army mobilized by Iraq's governor Ibn Ziyad intercepted and killed Husayn outside Kufa at the Battle of Karbala. Although it stymied active opposition to Yazid in Iraq, the killing of Muhammad's grandson left many Muslims outraged and significantly increased Kufan hostility toward the Umayyads and sympathy for the family of Ali.