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I don't have enough context to write an accurate overview of "781" since only "year" was provided as context. Could you share more information about what "781" refers to (such as a historical event, scientific discovery, cultural work, or other subject)?
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Coronation of Louis the Pious as sub-king of Italy and Aquitaine by pope Adrian I
Year 781 (DCCLXXXI) was a common year starting on Monday of the Julian calendar. The denomination 781 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.