Jamāl al-Dīn Abū al-Ḥajjāj Yūsuf ibn al-Zakī ʻAbd al-Raḥmān ibn Yūsuf ibn ʻAbd al-Malik ibn Yūsuf al-Kalbī al-Quḍā’ī al-Mizzī, also called Al-Ḥāfiẓ Abī al-Ḥajjāj, was a Syrian muhaddith and the foremost `Ilm al-rijāl Islamic scholar. Wikipedia