Assertion: caliph's son | /r/HasProperty | mu'awiya ii
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Source sentences:
text: When Caliph Yazid I and his son and successor, Mu'awiya II, died in quick succession in 683 and 684, respectively, Umayyad authority collapsed across the Caliphate and the Umayyads of the Hejaz, including Medina, were expelled by supporters of the rival caliph, the Mecca-based Abd Allah ibn al-Zubayr.