Yazid I
Yazid ibn Mu'awiya ibn Abi Sufyan (; 64611 November 683), commonly known as Yazid I, was the second caliph of the Umayyad Caliphate. He ruled from April 680 until his death in November 683. His appointment was the first hereditary succession to the caliphate in Islamic history. His caliphate was marked by the death of Muhammad's grandson Husayn ibn Ali and the start of the crisis known as the Second Fitna.