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I don't have specific context about what "440" refers to in relation to the year. To provide an accurate 2-sentence overview, I would need additional information about whether you're asking about a historical event, time period, or something else from the year 440. Could you provide more context?
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Article
Territories of the Northern Wei (blue) and Liu Song (Red) states (440)
Year 440 (CDXL) was a leap year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Valentinianus and Anatolius (or, less frequently, year 1193 Ab urbe condita). The denomination 440 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.