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1831 was a year in the Gregorian calendar. It falls within the 19th century and is notable for various historical events that occurred during that time period.
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August 21: Nat Turner leads two-month rebellion of slaves in the U.S. state of Virginia. July 21: King Leopold I takes constitutional oath rather than holding a coronation to become the first King of Belgium.
1831 (MDCCCXXXI) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Thursday of the Julian calendar, the 1831st year of the Common Era (CE) and Anno Domini (AD) designations, the 831st year of the 2nd millennium, the 31st year of the 19th century, and the 2nd year of the 1830s decade. As of the start of 1831, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.