Caesar (title)
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Caesar is a title of imperial character. It derives from the cognomen of Julius Caesar. The change from being a surname to a title used by the Roman emperors can be traced to AD 68, following the fall
Sculpture depicting Julius Caesar
Seal of the Caesar John Doukas
The Roman emperor Constantine the Great, mosaic in Hagia Sophia, Constantinople
Mehmed II and Ecumenical Patriarch of Constantinople Gennadios.
Augustus (title)
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Augustus was the main title of the Roman emperors during antiquity. It was given as both a name and a title to Gaius Julius Caesar Octavianus in 27 BC, marking his accession as Rome's first emperor. O
Caesar (title)
…to AD 68, following the fall of the Julio-Claudian dynasty. When used on its own, the title denoted heirs apparent, who would later adopt the title Augustus on accession. The title remained an essential part of the style of the emperors, and became the word for "emperor" in some languages, such as German…
Coin of the emperor Diocletian, marked diocletianus augustus
A bronze medallion of emperor Probus (r. 276–282), marked imp·c·probus·invic·p·f· aug
Coin of emperor Alexander II with the title augustos rom, 913.
Emperor Manuel II Palaiologos in a Byzantine miniature from c. 1404. The Greek text call hims "basileus and autokrator of the Romans, Palaiologos, always Augustus" (ΒΑϹΙΛΕΥϹ ΚΑΙ ΑΥΤΟΚΡΑΤΩΡ ΡΩΜΑΙΩΝ Ο ΠΑΛΑΙΟΛΟΓΟϹ ΚΑΙ ΑΕΙ ΑΥΓΟΥϹΤΟϹ), after the late antique formula "semper Augustus".