Year 1100 (MC) was a century leap year starting on Sunday (link will display the full calendar) of the Julian calendar, the 1100th year of the Common Era (CE) and Anno Domini (AD) designations, the 100th year of the 2nd millennium, the 100th and last year of the 11th century, and the 1st year of the 1100s decade. In the proleptic Gregorian calendar, it was a non-leap century year starting on Monday (like 1900).

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