The Canons of Hippolytus is a church order derived from Traditio apostolica, though incorporating major expansions of the original; although composed in Greek, it survives only in Arabic, itself a translation from a Coptic version of the Greek. Beyond directing the conduct of ordinations, initiation, and ritual meals, the text gives instructions for the conduct of Christians and Christian clergy, with a particular concern with the direction of ascetics as well as discussing the provision of a place of hospitality. Here a fresh English version is presented with annotation explaining the peculiarities of transmission and translation for those unequipped with Arabic. This is accompanied by a facing Arabic text for the benefit of those with some knowledge of the language. The text and notes are prefaced by an extensive introduction; of particular significance in the introduction is the re-examination of the date and provenance of the document. Whereas it has for centuries been assumed to have originated in Egypt, extensive evidence for a Cappadocian or Antiochene origin is presented. This leads to a major re-assessment of the value of the document for the liturgical historian, for the historian of asceticism in the fourth century, and for the social historian.