Abū Bakr Aḥmad ibn ʿAlī ibn Thābit ibn Aḥmad ibn Māhdī al-Shāfiʿī, commonly known as al-Khaṭīb al-Baghdādī (Arabic: الخطيب البغدادي) or "the lecturer from Baghdad" (10 May 1002 – 5 September 1071; 392 AH-463 AH), was a Sunni Muslim scholar known for being one of the foremost leading hadith scholars and historians at his time. He is widely considered an important authority in hadith, fiqh and history. Source: Wikipedia (en)