In Beyond Schools: Mu??Æammad born Ibr?h?±m al-Waz?±r ?s (d. 840/1436) Epistemology of Ambiguity , Damaris Wilmers provides the first extensive analysis of Ibn al-Waz?±r ?s thought and its role in the ?Sunnisation of the Zaydiyya ?, emphasizing its significance for conflicts between schools of thought and law beyond the Yemeni context. Contrasting Ibn al-Waz?±r ?s works with those of his Zaydi contemporary A??Æmad born Ya??Æy? born al-Murta???, Damaris Wilmers offers a study of a number of heretofore unedited texts from 9th/15th century Yemen when Zaydi identity was challenged by an increasing theological and legal diversity. She shows how Ibn al-Waz?±r, who has been classed with different schools, actually de-emphasized school affiliation and developed an integrative approach based on a unique theory of knowledge.