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I don't have specific context about what "1811" refers to beyond it being a year. To write an accurate, factual overview for a general reader, I would need additional information about which historical event, person, publication, or other subject associated with 1811 you're asking about.
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March 13: Battle of Lissa 1811 (MDCCCXI) was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1811th year of the Common Era (CE) and Anno Domini (AD) designations, the 811th year of the 2nd millennium, the 11th year of the 19th century, and the 2nd year of the 1810s decade. As of the start of 1811, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
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