Person
Abu Muslim
أبو مسلم الخراساني
d. 755 CE
Abu Muslim was the key military and organizational leader who initiated and led the Abbasid revolution in Khorasan, playing a decisive role in overthrowing the Umayyads.
Significance
Primary military leader of the Abbasid revolution
Reputation in tradition
mixed in tradition
Stated motivation
Overthrow Umayyad rule and establish Abbasid caliphate
Sources: Wikipedia and classical Islamic biographical literature compiled by automated researchers. Every page is being continuously refined — if something looks off, please check back in a few days.