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I don't have enough context to write an accurate overview of "451." The context provided only says "year," which isn't sufficient to determine what "451" refers to (it could be a book, film, historical event, scientific measurement, etc.). Could you provide more details about what "451" is?
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Invasion of Attila the Hun in Gaul (451)
Year 451 (CDLI) was a common year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Marcianus and Adelfius (or, less frequently, year 1204 Ab urbe condita). The denomination 451 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.