Augustus
Augustus' reign laid the foundations of a regime that lasted, in one form or another, for nearly fifteen hundred years through the ultimate decline of the Western Roman Empire and until the Fall of Constantinople in 1453. Both his adoptive surname, Caesar, and his title "Augustus" became the permanent titles of the rulers of the Roman Empire for fourteen centuries after his death, in use both at Old Rome and at New Rome. In many languages, "Caesar" became the word for "Emperor", as in the German "Kaiser" and in the Bulgarian and subsequently Russian "Tsar" (sometimes Csar or Czar). The cult of "Divus Augustus" continued until the state religion of the Empire was changed to Christianity in 391 by Theodosius I. Consequently, there are many excellent statues and busts of the first emperor. He had composed an account of his achievements, the "Res Gestae Divi Augusti", to be inscribed in bronze in front of his mausoleum. Copies of the text were inscribed throughout the Empire upon his death. The inscriptions in Latin featured translations in Greek beside it, and were inscribed on many public edifices, such as the temple in Ankara dubbed the "Monumentum Ancyranum", called the "queen of inscriptions" by historian Theodor Mommsen.
Fasti
Solinus observed that Gaius Pompeius Gallus and Quintus Verranius were consuls in Olympiad 207.1, and that this year was 801 AUC, counting from the foundation of Rome at Olympiad 7.1. By modern calculation this is 49 AD. He was relying on the official dating scheme, which must have been the "fasti consulares". In Varro's chronology this is AUC 802. Simple subtraction shows that AUC 1 in Augustus' fasti is 753/752 BC. The fasti give to the start of the republic a date of 244 AUC, but some editors "correct" all the AUC to Varronian. Similarly the fasti run to the death of Augustus in 13 AD (14 in the Varronian). This is not a difference in the starting date of the republic or the year of Augustus' death, which remain in the same years relative to surrounding events in either case; instead, the year of AUC 1 differs.