of Naysabur, Abu al-Hasan.
He studied under his father—the imam Abu Yaʿqub—as well as under Ahmad ibn Hanbal, ʿAli ibn al-Madini, Abu Musʿab, ʿAli ibn Hujr, and a number of other authorities.
Those who transmitted from him include Ismaʿil al-Khatabi, Ibn Qaniʿ, Ahmad ibn Khuzayma, Ahmad ibn Salm al-Khattali, Abu al-Qasim al-Tabarani, and others.
He first held the judiciary of Marw and later that of Naysabur.
Both he and his father passed away while on their journey.
The hafiz Abu ʿAbd Allah ibn al-Akhram said: “I heard him relate: ‘I entered upon Ahmad ibn Hanbal, who asked me, “Are you the son of Abu Yaʿqub?” I replied, “Yes.” He said, “Had you stayed with him, the benefit to you would have been far greater, for you will never see his like.”’” (1)
Al-Hakim stated that he died in Marw. This is a mistake, for Ibn Qaniʿ and Ibn al-Munadi both said that the Qaramitah killed him on the road to Mecca in the year 294 AH.
I say: he was nearly eighty.

276 – Abu Jaʿfar al-Tirmidhi, Muhammad ibn Ahmad ibn Nasr*
He was the imam, the erudite scholar, and—at his time—the leading Shafiʿi authority in Iraq, Abu Jaʿfar