Julius Caesar's adopted heir, who won the civil wars after Caesar's murder and in 27 BC became the first Roman emperor under the name Augustus. The month of August is named after him.
Octavian was the first emperor of the Roman Empire.
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As in English, Chinese calls the young man 屋大维 (Octavian) and the emperor after 27 BC 奥古斯都, from the title 'revered one' the Senate gave him. The long peace he began is the 罗马和平, Pax Romana.