A reliable, readable translation for scholars and students The Refutation of All Heresies (ca. 225 CE) is a treasure-trove of ancient philosophy, astrology, medicine, magic, Gnostic thought, numerology, heresiography, ecclesial politics, and early Christian studies in general. Offered here for the first time in almost a century is a full English translation, along with a newly-edited Greek text, extensive notes, and a thorough introduction. Features: A full English translation with extensive notes Newly edited Greek text that avoids the pitfalls of the most recent edition A thorough-going introduction that addresses the questions of authorship, date, and audience, as well as the purpose of the book, its organization, method, and importance for Gnostic studies