Ibn Kullab

Ibn Kullab (Arabic: ابن كُلاَّب) (d. ca. 241/855) was an early Sunni theologian (mutakallim) in Basra and Baghdad in the first half of the 9th century during the time of the Mihna and belonged, according to Ibn al-Nadim, to the traditionalist group of the Nawabit. He is often regarded as the true founder of the Ash'ari madhab. His movement, also called Kullabiyya, merged and developed into Ash'arism, which, along with Maturidism and Atharism (practically: Hanbalism), forms the theological basis of Sunni Islam.

Ibn Kullab headed a group made up of mainly direct and second generation students of Al-Shafi that included Al-Karibisi, Al-Qalanisi, Al-Muhasibi, Al-Bukhari, Abu Thawr and Dawud-al Zahiri. They were known for their extreme criticism of Jahmis, Mu'tazilis, and Anthropomorphists by using rationalistic methods (Kalaam) to defend orthodox creedal points of Sunni Islam. They contradicted the Mu'tazili doctrine of Khalq al-Qur'an (Createdness of the Qur'an) by introducing a distinction between the words of God (Kalam Allah) and its pronunciation.

He was praised by several famous scholars, including Ibn 'Asakir, Taj al-Din al-Subki, Ibn Hajar al-'Asqalani, Ibn Khaldun, Ibn Abi Zayd al-Qayrawani, Ibn Qadi Shuhba, Jamal al-Din al-Isnawi, Kamal al-Din al-Bayadi in his Isharat al-Maram, Abu Mansur al-Baghdadi in his work Kitab Usul al-Din, al-Shahrastani in al-Milal wa al-Nihal, and al-Kawthari.