This volume in honour of Johannes van Oort, formerly University of Utrecht, presently Professor of Patristics and Gnosticism at the Universities of Nijmegen and Pretoria, and past-President of the International Association of Manichaean Studies (IAMS), brings together a rich variety of studies on Augustine, Manichaeism, and other Gnostic currents, thus reflecting the honorand’s research interests. The unique collection is divided into four sections: I. Studies in Augustine: Confessions, Sermons, Letters & De Haeresibus; Augustine on Grace & Pluralism; Augustinian ‘Gnosis’; II. Studies in Manichaeism: Origins & Myth; Doctrines & Cult; Diffusion & Art; III. Studies in Manichaeism and Augustine: Doctrines; Polemics & Debates with Manichaean Contemporaries; IV. Studies in ‘Other Gnosticism’: Gnosticism and ‘Apocryphal’ Texts; Sources of (Ps.) Hippolytus’ Refutatio; the Gospel of Judas; Modern Yesidi Gnosticism. The 35 studies are preceded by an overview of Prof. van Oort’s scholarly activities and publications