who was marwan i?
He was the fourth Umayyad caliph
Marwan I
Marwan ibn al-Hakam ibn Abi al-As ibn Umayya (), commonly known as Marwan I (c. 623 or 626 – April/May 685), was the fourth Umayyad caliph, ruling for less than a year in 684–685. He founded the Marwanid ruling house of the Umayyad dynasty, which replaced the Sufyanid house after its collapse in the Second Muslim Civil War and remained in power until 750. 

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Marwan I [SEP] Introduction
Before his death, Marwan firmly established his sons in positions of power: Abd al-Malik was designated his successor, Abd al-Aziz was made governor of Egypt and Muhammad oversaw military command in Upper Mesopotamia. Although Marwan was stigmatized as an outlaw and a father of tyrants in later anti-Umayyad tradition, the historian Clifford E. Bosworth asserts that the caliph was a shrewd, capable and decisive military leader and statesman who laid the foundations of continued Umayyad rule for a further sixty-five years.