Abū ʿUthman ʿAmr b. ʿUbayd b. Bāb (c. 80-144/699-761) was a traditionist and theologian who became famous as one of the founders of the Muʿtazilite school of theology. His family originated in the region of Kabul, in Afghanistan; his grandfather Bāb was captured there during the Islamic conquests and was relocated to Basra. ʿAmr's father worked as a weaver but also served in the Umayyad army in Iraq. ʿAmr followed his father in his profession as a weaver, and he joined the teaching circle of the