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I don't have enough context to write an accurate overview of "455." The context provided only indicates "year," which could refer to the year 455 CE, but without additional information about what specific event, topic, or subject "455" refers to, I cannot write a factually accurate overview. Could you provide more context about what "455" refers to?
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King Genseric sacks Rome (455)
Year 455 (CDLV) was a common year starting on Saturday of the Julian calendar. At the time, it was known as the Year of the Consulship of Valentinianus and Anthemius (or, less frequently, year 1208 Ab urbe condita). The denomination 455 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.