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.
Roman triumph
Following Caesar's murder, Octavian assumed permanent title of "imperator" and became permanent head of the Senate from 27 BCE (see principate) under the title and name Augustus. Only the year before, he had blocked the senatorial award of a triumph to Marcus Licinius Crassus the Younger, despite the latter's acclamation in the field as Imperator and his fulfillment of all traditional, Republican qualifying criteria except full consulship. Technically, generals in the Imperial era were legates of the ruling Emperor (Imperator). Augustus claimed the victory as his own but permitted Crassus a second, which is listed on the "Fasti" for 27 BCE. Crassus was also denied the rare (and technically permissible, in his case) honour of dedicating the "spolia opima" of this campaign to Jupiter Feretrius.