Amr ibn Ubayd

Amr Ibn Ubayd ibn Bāb (Arabic: عمرو بن عبيد بن باب, died 761) was one of the earliest leaders in the "rationalist" theological movement of the Mu'tazilis, literally 'those who withdraw themselves' – which was founded by Wasil ibn Ata (died 749). Of Iranian descent, he was a student of the famous early theologian Hasan al-Basri, and led the Mutazilis during the early years of the Abbasid caliphate. He generally followed a quietist political stance toward the Abbasid political establishment.