|Biographical detail : || He was a disciple of Imam Abu Hanifa.
He along with Muhammad Shibani compiled the Fiqah-E-Hanfi that is followed almost all over the World. He was the author of Kitab-ul-Kharaj amongst others.
In the history of Islam, he was the first person to be appointed as Qazi-ul-Quzat.
His full name was Abu Yusuf Yaqub bin Ibrahim.