E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
No proper name, but a mere title given to Octavian, because he was head of the priesthood. In the reign of Diocletian the two emperors were each styled Augustus (sacred majesty), and the two viceroys Cæsar. Prior to that time Hadrian limited the title of Cæsar to the heir presumptive.
Augustus. Philippe II. of France; so called because he was born in the month of August. (1165, 11801223.)