Ibn Khallad was a disciple of the famous Mu?tazili theologian, Abu Hashim al-Jubba?i (d. 933). His otherwise lost theological summa, K. al-U?ul, has reached us embedded in the Ziyadat Shar? al-U?ul by the Zaydi Imam al-Na?iq bi-l-?aqq (d. 1033). This volume contains an editio princeps of this text.
