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The 620s decade ran from January 1, 620, to December 31, 629.
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Year 622 (DCXXII) was a common year starting on Friday of the Julian calendar, the 622nd year of the Common Era (CE) and Anno Domini (AD) designations, the 622nd year of the 1st millennium, the 22nd year of the 7th century, and the 3rd year of the 620s decade. The denomination 622 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 623 (DCXXIII) was a common year starting on Saturday of the Julian calendar. The denomination 623 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 610s decade ran from January 1, 610, to December 31, 619.
The 630s decade ran from January 1, 630, to December 31, 639.
The 640s decade ran from January 1, 640, to December 31, 649.
The 650s decade ran from January 1, 650, to December 31, 659.
The 580s decade ran from January 1, 580, to December 31, 589.
The 590s decade ran from January 1, 590, to December 31, 599.
Year 624 (DCXXIV) was a leap year starting on Sunday of the Julian calendar. The denomination 624 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 625 (DCXXV) was a common year starting on Tuesday of the Julian calendar. The denomination 625 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 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 627 (DCXXVII) was a common year starting on Thursday of the Julian calendar. The denomination 627 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 628 (DCXXVIII) was a leap year starting on Friday of the Julian calendar. The denomination 628 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 629 (DCXXIX) was a common year starting on Sunday of the Julian calendar. The denomination 629 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 613 (DCXIII) was a common year starting on Monday of the Julian calendar. The denomination 613 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 617 (DCXVII) was a common year starting on Saturday of the Julian calendar. The denomination 617 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 619 (DCXIX) was a common year starting on Monday of the Julian calendar. The denomination 619 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 siege of Constantinople in 626 by the Sassanid Persians and Avars, aided by large numbers of allied Slavs, ended in a strategic victory for the Byzantines. The failure of the siege saved the empire from collapse, and, combined with other victories achieved by Emperor Heraclius the previous year and in 627, enabled Byzantium to regain its territories and end the destructive Roman–Persian Wars by enforcing a treaty with borders status quo c. 590.
The Byzantine–Sasanian War of 602–628 was the final and most devastating of the series of wars fought between the Byzantine Empire and the Sasanian Empire of Iran. The previous war between the two powers had ended in 591 after Emperor Maurice helped the Sasanian king Khosrow II regain his throne. In 602 Maurice was murdered by his political rival Phocas. Khosrow proceeded to declare war, ostensibly to avenge the death of the deposed emperor Maurice. This became a decades-long conflict, the longest war in the series, and was fought throughout the Middle East: in Egypt, the Levant, Mesopotamia, the Caucasus, Anatolia, Armenia, the Aegean Sea and before the walls of Constantinople itself.
The 600s decade ran from January 1, 600, to December 31, 609.