Title: al-Imām al-Mahdī ḥaqīqah tārīkhīyah am faraḍīyah falsafīyah
Subjects: Mahdi, Imams (Shiites), Shīʻah, Doctrines
People: Muḥammad ibn al-Ḥasan Mahdī (869-), Aḥmad Kātib