Ibn Rajab

Abd al-Rahman ibn Ahmad ibn Rajab (736-795 AH / 1335–1393 CE), commonly known as Ibn Rajab, (which was a nickname he inherited from his grandfather who was born in the month of Rajab), was a muhaddith, scholar, and jurist. Notable for his commentary on the forty hadith of Imam Al-Nawawi, he was also the initial author of Fath al-Bari. Provided by Wikipedia