Al-Zubayr ibn Bakkar
He composed a number of works on genealogy that made him a standing authority on the subject of the genealogies of the Quraysh tribe.Ibn Hajar al-Asqalani regarded him as the most reliable authority on Qurayshite genealogy.[3] He was born and raised in Medina and served as the qadi of Mecca in 242 AH (c. 864 CE).[4] In one of his visits to Baghdad, Ibn Bakkar was invited by the Abbasid caliph al-Mutawakkil to become the tutor to his son.[1] He died in Mecca after he fell from a roof.