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Year 477 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Pulvillus and Lanatus [1] (or, less frequently, year 277 Ab urbe condita ). The denomination 477 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. [2]
The A.D. system spread when the Emperor Charlemagne adopted it for dating acts of government throughout Europe.