Ibn ʻUlayyah

Abu Bishr Isma'il ibn Ibrahim ibn Muqsim ( ;729 809 CE), commonly known as Ibn 'Ulayya , was a hadith scholar, faqih and a mufti from Basra.

Background Ibn Ulayya belonged to a family of scholars, all of whom were known as Ibn Ulayya. Ibn Ulayya was hailed by every traditionist who knew him. His pupil included such prominent scholars as al-Shafi'i, Shu'ba Ibn al-Ḥajjāj, Yahya ibn Ma'in and Ali ibn al-Madini.

His son, Ibrahim ibn Ulayya (died 833), was also a famous scholar. He eventually settled in Egypt, where his ideas remained prominent throughout 9th century. Although Ibrahim ibn Ulayya was a rationalist, he did not display any clear relation with then dominant Mu'tazalite thought. He held the view that Qur'an was created and is considered one of the earliest proponents of the theory of consent (known as ijma) in Islam.