al-Ḥasan ibn ʿAlī ibn Shabīb al-Baghdādī, known as al-Maʿmarī. He was born around the year 210 AH.

He heard ḥadīths from: Shaybān ibn Farrūkh, Abū Naṣr al-Tammār, ʿAlī ibn al-Madīnī, Khalaf ibn Hishām, Hudbah ibn Khālid, Saʿīd ibn ʿAbd al-Jabbār, Suwayd ibn Saʿīd, Jubārah ibn al-Mughallis, ʿĪsā ibn Zughbah, Duḥaym, and their contemporaries in Syria, Egypt, and Iraq. He collected ḥadīths, authored works, and attained prominence.

Among those who narrated from him were: Abū Bakr al-Najjād, Abū Sahl ibn Ziyād, the judge Aḥmad ibn Kāmil, Ibn Qāniʿ, Aḥmad ibn ʿĪsā al-Tammār, Muḥammad ibn Aḥmad al-Mufīd, Abū al-Qāsim al-Ṭabarānī, and many others.

Al-Khaṭīb said (1): “He was one of the vessels of knowledge: renowned for his discernment, described for his memorization. His corpus contains singularities and narrations in which he is alone.”

Al-Dāraquṭnī said: “He is truthful, a ḥāfiẓ. Mūsā ibn Hārūn impugned him—there was enmity between them—and he rejected the ḥadīths for which al-Maʿmarī had produced his original collections; afterwards he ceased transmitting them (2).”

ʿAbdān al-Ahwāzī said: “I have never seen a ḥadīth scholar on earth like al-Maʿmarī (3).”

Mūsā ibn Hārūn said: “I sought Allah’s guidance for two full years before I spoke against al-Maʿmarī, because I had written alongside him from the same shaykhs and we never parted company. But when I saw those…"