Year 821 (DCCCXXI) was a common year starting on Tuesday of the Julian calendar.
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. 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 820s decade ran from January 1, 820, to December 31, 829.
The 830s decade ran from January 1, 830, to December 31, 839.
The 870s decade ran from January 1, 870, to December 31, 879.
The 700s decade ran from January 1, 700, to December 31, 709.
The 610s decade ran from January 1, 610, to December 31, 619.
Year 840 (DCCCXL) was a leap year starting on Thursday of the Julian calendar.
The 660s decade ran from January 1, 660, to December 31, 669.
The 690s decade ran from January 1, 690, to December 31, 699.
The 580s decade ran from January 1, 580, to December 31, 589.
Year 626 (DCXXVI) was a common year starting on Wednesday of the Julian calendar. The denomination 626 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 457 (CDLVII) was a common year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Constantinus and Rufus. The denomination 457 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 822 (DCCCXXII) was a common year starting on Wednesday of the Julian calendar.
Year 610 (DCX) was a common year starting on Thursday of the Julian calendar, the 610th year of the Common Era (CE) and Anno Domini (AD) designations, the 610th year of the 1st millennium, the 10th year of the 7th century, and the 1st year of the 610s decade. The denomination 610 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 705 (DCCV) was a common year starting on Thursday of the Julian calendar. The denomination 705 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 709 (DCCIX) was a common year starting on Tuesday of the Julian calendar. The denomination 709 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 877 (DCCCLXXVII) was a common year starting on Tuesday of the Julian calendar.
