Title: Risālat al-Imām Aḥmad ibn Ḥanbal ilá al-Khalīfah al-Mutawakkil al-ʻAbbāsī
Subjects: Correspondence, Early works to 1800, Evidences, authority, Islam, Doctrines, Hadith, Qurʼan
People: Aḥmad ibn Muḥammad Ibn Ḥanbal (780-855), Mutawakkil ʻAlá Allāh Caliph (822-861)