Al-Haafidh Shihabuddin Abu'l-Fadl Ahmad ibn Ali ibn Muhammad, better known as Ibn Hajar due to the fame of his forefathers, al-Asqalani due to his family origin  (18 February 1372 – 2 February 1449, 852 A.H.), was a medieval Shafiite Sunni scholar of Islam who represents the entire realm of the Sunni world in the field of Hadith, also known as Shaykh al Islam. He authored some 50 works on hadith, history, biography, tafsir, poetry, and Shafi'ite jurisprudence, the most valued of which being his commentary of the Sahih of Bukhari, titled Fath al-Bari.