and one of the leading luminaries of Islam, by the unanimous testimony of the people of merit; his writings were marvelously arranged and strikingly original, and he was a foremost, venerated imam. Among the calamities that befell Nishapur was his departure from it. (1)

It was also said that when he reached Isfarayin, the people there rejoiced at his arrival to an extraordinary degree. (2)

I myself possess some of his high-level isnāds, and I had once prepared a separate biographical notice for him, though I have not been able to locate it at this moment.

He died in Isfarayin in 429 AH, having reached an advanced age. (3)

He authored several works on dialectical theology and the rational sciences. (4)

As for:

378 – Abū Manṣūr al-Ayyūbī, Muḥammad ibn al-Ḥasan*

the theologian from Nishapur, he was a brilliant and sharp-witted imam.

ʿAbd al-Ghāfir said: “He is Muḥammad ibn al-Ḥasan ibn Abī Ayyūb, the ustadh Abū Manṣūr, the Proof of the Religion, master of lucid exposition, decisive argumentation, and sound reasoning. Of all those in his time who followed the Ashʿarī school, he was the most adept dialectician. He studied under Ibn Fūrak, and though poor, he was upright, content, and prolific in writing.” (5)

He passed away in Dhū al-Ḥijjah of 421 AH.