Person ʿUthmān b. Abū Bakr b. Yūsuf b. ʾAḥmadName variants:ʿUthmān b. Abū Bakr b. Yūsuf b. ʾAḥmad: P.Berl.inv. 8009Witness in a sale contract dated 445 AH (P.Berl.inv. 8009).