What did Abu Muslim Khorasani do?

Biography of Abu Moslem Khorasani (The great Iranian general)

  Abu Muslim Khorasani (718-755 AD) He was one of Iran's military commanders and the leader of the Black Jamgan movement, who was able to overthrow the Umayyad dynasty and establish the Abbasid dynasty.. His original name was Behzadan son of Vandad, who was changed to Abdur Rahman on the advice of Ibrahim Imam, one of the elders of Bani Abbas.…