Question: Under which dynasty did this Persian general serve who used the Black Standard in his uprising leading to the Abbasid Revolution in 747?
Sentence (from "Black Standard"): The Black Banner or Black Standard (Arabic: راية السوداء‎ ‎ "rāyat as-sawdāʾ", also known as راية العقاب "rāyat al-ʿuqāb" "banner of the eagle" or simply as "ar-rāya " "the banner") is one of the flags flown by Muhammad in Islamic tradition.
Relevant evidence: No