Al-Fadl ibn al-Rabi'

Al-Fadl ibn al-Rabi, was one of the most influential officials of the Abbasid Caliphate in the reigns of Harun al-Rashid and al-Amin, whom he served as chamberlain and chief minister. Fadl played an important role as the chief instigator of the civil war that erupted after Harun's death, siding with al-Amin against his half-brother al-Ma'mun. After al-Ma'mun's victory he went into hiding, but eventually reconciled himself with the new ruler.