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 statues and busts of the first emperor.
Caesar's adopted surname and title, Augustus, became the permanent titles of Roman rulers for fourteen centuries after his death, used in both Old Rome and New Rome. In many languages, Caesar became synonymous with emperor, as in German Kaiser and Bulgarian/Russian Tsar (sometimes Csar or Czar). The cult of Divus Augustus persisted until the empire's state religion was changed to Christianity by Theodosius I in 391 AD. Consequently, numerous statues and busts of the first emperor exist.