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27 BC was the year when the Roman Republic officially ended and the Roman Empire began under Augustus, who received the title "Augustus" from the Senate and consolidated power as the first Roman Emperor. This date marks a fundamental turning point in Western history, as it established the imperial system that would govern Rome for the next 500 years and profoundly shape the development of European civilization.
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Imperator Caesar Augustus
Year 27 BC was either a common year starting on Sunday, Monday or Tuesday or a leap year starting on Monday of the Julian calendar (the sources differ, see leap year error for further information) and a common year starting on Sunday of the Proleptic Julian calendar. At the time, it was known as the Year of the Second Consulship of Octavian and Agrippa (or, less frequently, year 727 Ab urbe condita). The denomination 27 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.