The 800s decade ran from January 1, 800, to December 31, 809.
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.
The 810s decade ran from January 1, 810, to December 31, 819.
The 830s decade ran from January 1, 830, to December 31, 839.
The 840s decade ran from January 1, 840, to December 31, 849.
The 790s decade ran from January 1, 790, to December 31, 799.
The 780s decade ran from January 1, 780, to December 31, 789.
The 770s decade ran from January 1, 770, to December 31, 779.
The 760s decade ran from January 1, 760, to December 31, 769.
The 750s decade ran from January 1, 750, to December 31, 759.
The 700s decade ran from January 1, 700, to December 31, 709.
Year 742 (DCCXLII) was a common year starting on Monday of the Julian calendar, the 742nd year of the Common Era (CE) and Anno Domini (AD) designations, the 742nd year of the 1st millennium, the 42nd year of the 8th century, and the 3rd year of the 740s decade. The denomination 742 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 840 (DCCCXL) was a leap year starting on Thursday in the Julian calendar, the 840th year of the Common Era (CE) and Anno Domini (AD) designations, the 840th year of the 1st millennium, the 40th year of the 9th century, and the 1st year of the 840s decade.
Year 842 (DCCCXLII) was a common year starting on Sunday of the Julian calendar, the 842nd year of the Common Era (CE) and Anno Domini (AD) designations, the 842nd year of the 1st millennium, the 42nd year of the 9th century, and the 3rd year of the 840s decade.
Year 754 (DCCLIV) was a common year starting on Tuesday of the Julian calendar, the 754th year of the Common Era (CE) and Anno Domini (AD) designations, the 754th year of the 1st millennium, the 54th year of the 8th century, and the 5th year of the 750s decade. The denomination 754 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
The 960s decade ran from January 1, 960, to December 31, 969.
The 560s decade ran from January 1, 560, to December 31, 569.
The 590s decade ran from January 1, 590, to December 31, 599.
Year 797 (DCCXCVII) was a common year starting on Sunday of the Julian calendar. The denomination 797 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
The 600s decade ran from January 1, 600, to December 31, 609.
