مروان بن الحكم
Three Umayyad caliphs reigned during the twelve years of Ibn al-Zubayr's caliphate between 680 and 692. The short terms indicated in the upper plot in light blue and yellow correspond to the tenures of Mu'awiya II and Marwan I, respectively. (Note that a caliph's succession does not necessarily occur on the first day of the new year.)