A bit of high school history here:
Why is no leader of this Wahhabi “Khorasan” group called Abu Muslim Al Khorasani? Given their penchant for noms de guerre starting with Abu and their use of Khorasan (a province in northeastern Persia/Iran)?
Abu Muslim Al Khorasani (also reportedly a nom de guerre) was the original man behind the original ‘black flag’. A Persian, he led the forces of the Abbasid, the original black flag revolution that overthrew the Umayyad dynasty which ruled from Damascus, in the eighth century (A.D.). The last Umayyad Caliph was named Marwan, he was nicknamed by some Al Homar (the Jackass) for obvious reasons.
After the Abbasids took power and started their dynasty, they started to eliminate their former allies and potential future rivals. They started by beheading the man who made their revolution possible, Abu Muslim Al Khorasani.
The Abbasids ruled for five centuries, often through Persian and Turkish surrogates and top ministers. The Abbasids were more cosmopolitan than their predecessors: they intermarried extensively with other ‘subjected’ peoples. They also shared administrative duties, unlike the extremely tribal Umayyads who kept power and influence within their own tribal kin.
The Abbasid rule was ended by the Mongols who sacked Baghdad and trampled the last Caliph, al-Must’asim, to death under their horses hoofs (reportedly after rolling him inside a nice Persian carpet).
Cheers
Mohammed Haider Ghuloum