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I don't have specific context about "1815" to draw from in your message. Could you clarify what "1815" refers to—for example, is it a book, film, historical event, or something else? That would help me write an accurate overview based on available information.
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Article
June 18: Napoleon defeated by Wellington at the Battle of Waterloo, bringing an end to the "Hundred Days" crisis after Napoleon's escape from Elba June 19: Congress of Vienna redraws boundaries of the European nations.
February 26: Napoleon Bonaparte escapes from Elba. 1815 (MDCCCXV) was a common year starting on Sunday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1815th year of the Common Era (CE) and Anno Domini (AD) designations, the 815th year of the 2nd millennium, the 15th year of the 19th century, and the 6th year of the 1810s decade. As of the start of 1815, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.