(995–1067 (AH 385–460)). Leading Shi‘ite scholar. Born in s (hence the name), he played an important part in stabilizing the religion in practice after the occultation (see hidden Im m ) of the twelfth Im m . He collected Shi‘ite traditions in al-Istib r (The Examination) and in Ta dh b al-A k m (The Correcting of Judgements), which form part of the ‘Four Books’ of authoritative traditions. Even more influential was his Kit b al-Nih ya (The Book of Method), which lays out the basis of Shi‘ite legal procedure, and which became the foundation of a legal school which endured for centuries after his death. After riots, during which his library was burnt, he moved to al-Najaf where he died.