9 BC was a regular year in the Julian calendar system used in ancient Rome. It matters primarily as a reference point in history, falling during the late reign of Augustus and marking a specific moment in the ancient world's timeline.
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Year 9 BC was either a common year starting on Wednesday, Thursday or Friday or a leap year starting on Thursday of the Julian calendar (the sources differ, see leap year error for further information) and a leap year starting on Monday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Drusus and Crispinus (or, less frequently, year 745 Ab urbe condita). The denomination 9 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.
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