, abū bakr ʿabd al-raḥmān b. kaysān , died 200/816 or 201/817, early theologian and
mufassir , commonly counted among the Muʿtazilīs, although always treated as an outsider by the Muʿtazilī
ṭabaḳāt . In his youth he served, together with other
mutakallimūn like Muʿammar, Ḥafṣ al-Fard and Abū S̲h̲amir al-Ḥanafī, as
g̲h̲ulām ) to Maʿmar Abu ’l-As̲h̲ʿat̲h̲, a Baṣran physician with certain “philosophical” leanings (cf.
Fihrist, ed. Flügel, 100, 11. 28 ff). In the later days of Ḍirār b. ʿAmr [
q.v.], i.e. in the last quarter of the 2nd century A.H., he created in Baṣra a …