The Diocletian era , also called Diocletian calendar (= aera Diocletiani ) or era of the martyrs (= aera martyrum ), is an era calendar that was mainly used in the Coptic calendar in the fifth to seventh centuries, but also later. It begins on August 29, 284, the beginning of the first year of the reign of the Roman emperor Diocletian (he was only proclaimed emperor on November 17, 284), but was only introduced after his death. Christian- Nubian monuments and documents are also dated according to this era.
- Carl Bertheau : Era. In: Samuel M. Jackson (Ed.): The New Schaff-Herzog Encyclopedia of Religious Knowledge. Funk and Wagnalls, New York 1909, Vol. 4, pp. 162 f., Online
- Jack Finegan: Handbook of Biblical Chronology. Principles of Time Reckoning in the Ancient World and Problems of Chronology in the Bible. Hendrickson, Peabody, Mass. 1998, ISBN 1-56563-143-9 , p. 113.
- Winfried Görke: Date and Calendar. From antiquity to the present. Springer, Berlin a. a. 2011, ISBN 978-3-642-13147-9 , p. 4, 33 f.