Year 801 (DCCCI) was a common year starting on Friday of the Julian calendar, the 801st year of the Common Era (CE) and Anno Domini (AD) designations, the 801st year of the 1st millennium, the 1st year of the 9th century, and the 2nd year of the 800s decade.
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800s (decade) in the context of 800
Year 800 (DCCC) was a leap year starting on Wednesday of the Julian calendar, the 800th year of the Common Era (CE) and Anno Domini (AD) designations, the 800th year of the 1st millennium, the 100th and last year of the 8th century, and the 1st year of the 800s decade. It was around this time that the Anno Domini calendar era became the prevalent method in Europe for naming years, so from this time on, the years began to be known as 800 and onwards.
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