Yazid I
Before Yazid I died, he had the "bay'ah" made to his son Mu'awiya. Mu'awiya succeeded his father in Damascus in 64 AH (November 683 CE), at an age of somewhere between 17 and 23. He was supported by the Kalb tribe, but his authority was likely only recognised in Damascus and southern Syria, with Abd Allah ibn al-Zubayr claiming the caliphate from his base in the Hejaz.