This article examines some of the legacy of the Irish education pioneer Nano Nagle, foundress of the Presentation congregation of nuns. The congregation spread rapidly in the nineteenth century, not only in Ireland but also in Newfoundland, India, England, Tasmania, Australia and continental North America. This year, Presentation schools globally mark the tercentenary of Nagle's birth, and it is therefore timely to consider approaches to writing about her life and her contribution to education. The article discusses existing biographical studies of Nagle and argues that a more nuanced study of this educator and her legacy is possible, through the careful and systematic use of convent archives and oral histories. The article considers how such research can offer new perspectives on the agency and innovation of individual teaching Sisters, and on ways in which these women became resilient and adaptable, in order to function effectively within a patriarchal Church.