Answer
Yazid I, the Ummayad caliph who reigned from 680 to 683, is generally regarded by modern historians as a competent and capable ruler, though not as successful as his father, Mu'awiya I. Yazid faced numerous challenges during his brief reign, including a rebellion led by Husayn ibn Ali, the grandson of the Prophet Muhammad. Despite these challenges, Yazid managed to maintain the unity and stability of the vast Umayyad caliphate.