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The so-called Decretum Gelasianum or Gelasian Decree was traditionally attributed to the prolific Pope Gelasius I, bishop of Rome 492–496. In surviving manuscripts the Decretal exists on its own and also appended to a list of books of Scripture titled as attested as canonical by a Council of Rome under Pope Damasus I, bishop of Rome 366–383. Since that list contains a quotation from Augustine, writing about 416, it is evident that the title Incipit Concilium Vrbis Romae sub Damaso Papa de Explanatione Fidei, the so-called Damasine List, is of no historical value, although the canon presented herein represents the same canon as shown in the Council of Carthage Canon 24, 415 AD 
The Decretum is in several parts: the second part is a canon catalogue, and the fifth part is a catalogue of the 'apocrypha' and other writings which are to be rejected. The canon catalogue gives 26 books of the New Testament (Parts 1, 3, and 4 are not relevant to the canon.)
- The Development of the Canon": Decretum Gelasianum gives the full list, including the apocrypha "which are to be avoided by Catholics."
- Decretum Gelasianum: at The Latin Library.
- Decretum Gelasianum: in English.
- Review of Ernst von Dobschütz, Das Decretum Gelasianum de libris recipiendis et non recipiendis in kritischem Text Leipzig, 1912: F. C. Burkitt in Journal of Theological Studies 14 (1913) pp. 469–471.