Octavian's rise as Augustus Caesar signaled the end of the Roman Republic and the start of the Roman Empire.
Octavian's ascent to power as Augustus Caesar directly marked the end of the Roman Republic and the advent of the Roman Empire. After defeating Mark Antony and Cleopatra in the Battle of Actium, Octavian emerged as the undisputed master of the Roman world and eventually assumed the title Augustus, becoming the first Roman Emperor.
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