Instrumenta Patristica et Mediaevalia. Research on the Inheritance of Early and Medieval Christianity publishes reference works and seminal studies on patristic and medieval authors and subjects. Founded by Dom Eligius Dekkers († 1998) as Instrumenta Patristica, its initial aim was to offer a series of tools for scholars of patristic studies, with an emphasis on manuscript catalogues and bibliographical directories of major authors such as Origen, Augustine, and Jerome. As Instrumenta Patristica et Mediaevalia, the series has widened its scope to include medieval Christianity. It now welcomes all studies that are instrumental to research on the inheritance of Christianity before 1500 AD.