The Apostolic Tradition is a book traditionally attributed to Hippolytus of Rome. This book is a mine of information about liturgy and canon law. Scholars believe that this text was composed in the year 215 a.d. The original Greek of this text is lost.
However, we have a Coptic and a Copto-Arabic translation as well as an Ethiopian one. In a later era, an anonymous author used it as the basis for the Canons of Hippolytus.