Hafiz Ibn Kathir mentions in Al-Bidayah wa ‘l-Nihayah (part 11, p. 180) regarding those eminent individuals who died in 322 ah:
Muhammad ibn Ahmad ibn al-Qasim Abu ‘Ali al-Rudhbari -- it is said his name was Ahmad ibn Muhammad and also said al-Husayn ibn al-Humam; the first is correct. He was originally from Baghdad and lived in Egypt. He was from the offspring of leaders, viziers and learned men.
He remained in the company of Junayd, heard hadith and...