al-Hakim al-Nisaburi

Abu 'Abdallah Muhammad b. 'Abdallah b. Muhammad b. Hamduya al-Dabbi al-Tahmani of Nishapur, the hafiz known as Ibn al-Bayyi'; he learned fiqh on al-Shafi'i's madhhab then sought hadith until it mastered him and he was famed for it — he heard it from a company too numerous to count, his mu'jam of shaykhs nearing two thousand men. ¹

He wrote in its sciences what reached fifteen hundred parts; among his singular works, al-Mustadrak 'ala'l-sahihayn, Tarikh 'ulama' Naysabur, al-Madkhal ila 'ilm al-sahih and Fada'il al-imam al-Shafi'i. ¹