In Beyond Schools: Muhammad b. Ibrahim al-Wazir’s (d. 840/1436) Epistemology of Ambiguity, Damaris Wilmers provides the first extensive analysis of Ibn al-Wazir’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-Wazir’s works with those of his Zaydi contemporary Ahmad b. Yahya b. al-Murtada, 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-Wazir, who has been classed with different schools, actually de-emphasized school affiliation and developed an integrative approach based on a unique theory of knowledge.