During the reign of Abu Ja far a-Mansur. the second Abbasid caliph. several revolts broke outundermining the newly established caliphate. The revolts were launched by the two brothers of the HasanidAlids: Muhammad al-Nafs al-Zakiyya and Ibrahim b. https://www.roneverhart.com/AMS-Neve-1073SPX-Single-Preamp-and-EQ-p33827/