Al-Ma'mun, the Inquisition and the Quest for Caliphal Authority

The "inquisition" (Mihnah) unleashed by the seventh Abbasid caliph, 'Abdallah al-Ma'mun (r. 813-833), has long attracted the attention of modern scholars of the intellectual, political, and religious history of the early Abbasid era. Historians have seen it as the key to a wide array of puzzles and problems in early Islamic history.