Double your dating method
The same is true with regard to the correctness of the dates which do appear in official documents, especially those of the early Middle Ages.
For example, no trace of it will be found in that great historian of the Gallic Church, St. Augustine of England; and in the writings of Pope St.But for the dating of papal documents and for the so-called "double date" see the article BULLS AND BRIEFS.Before the Christian Era was generally adopted in the dating of documents various other systems were employed at different periods and in different countries.In the intervening year which breaks this series into two parts falls the death of Bede A. 735." Very noteworthy is the decree of an English synod held in 816, wherein it is prescribed that the bishop shall put the acts of the synod into writing and date them by the Era of the Incarnation.
This points no doubt to a time "when ecclesiastics knew the era well enough but had not yet acquired the punctual habit of using it".But even the bulls of such a pontiff as Innocent III are not unfrequently at fault, and as Léopold Delisle has shown, an erroneous calculation of the indiction may be perpetuated through a whole series of authentic documents (Bib. The point of main interest in this connection is to determine the source and period of the introduction of our present system of dating by the Christian Era.