As the name implies, it is a calendar used during the Byzantine Empire, it was established by Constantine I in 312 AD. C . which would be the 5821 of its chronology since it is based on the Antiochene era calculated by Panodorus of Alexandria, which begins with the creation of Adam according to the biblical account, occurred according to his studies on September 1, 5509 BC. C . . This system ceased to be used with the fall of Constantinople, although it persisted in Russia until the 17th century. See Anno Mundi, Etos Kosmou, Gregorian, Julian.
