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I don't have enough context to write an accurate overview of "405." The single word "year" doesn't provide information about what "405" refers to—it could be a highway, a year in history, a law, a film, or something else entirely. I'd need more specific context to write an accurate and neutral overview.
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The Colosseum in Rome
Year 405 (CDV) was a common year starting on Sunday of the Julian calendar. At the time, it was known as the Year of the Consulship of Stilicho and Anthemius (or, less frequently, year 1158 Ab urbe condita). The denomination 405 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.