1200 (MCC) was a leap year starting on Saturday of the Julian calendar, the 1200th year of the Common Era (CE) and Anno Domini (AD) designations, the 200th year of the 2nd millennium, the 100th and last year of the 12th century, and the 1st year of the 1200s decade. As of the start of 1200, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.
The Proleptic Gregorian calendar called it a century leap year.