The 820s decade ran from January 1, 820, to December 31, 829.
The 710s decade ran from January 1, 710, to December 31, 719.
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 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.
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.
Year 635 (DCXXXV) was a common year starting on Sunday of the Julian calendar. The denomination 635 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 639 (DCXXXIX) was a common year starting on Friday of the Julian calendar. The denomination 639 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 746 (DCCXLVI) was a common year starting on Saturday of the Julian calendar. The denomination 746 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 649 (DCXLIX) was a common year starting on Thursday of the Julian calendar. The denomination 649 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 652 (DCLII) was a leap year starting on Sunday of the Julian calendar. The denomination 652 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 640 (DCXL) was a leap year starting on Saturday of the Julian calendar. The denomination 640 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 641 (DCXLI) was a common year starting on Monday of the Julian calendar. The denomination 641 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 642 (DCXLII) was a common year starting on Tuesday of the Julian calendar. The denomination 642 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 645 (DCXLV) was a common year starting on Saturday of the Julian calendar. The denomination 645 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 656 (DCLVI) was a leap year starting on Friday of the Julian calendar. The denomination 656 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 Muslim conquest of Egypt, led by the army of 'Amr ibn al-'As, took place between 639 and 646 and was overseen by the Rashidun Caliphate. It ended the seven centuries long period of Roman reign over Egypt that began in 30 BC. Byzantine rule in the country had been shaken, as Egypt had been conquered and occupied for a decade by the Sassanid Iran in 618–629, before being recovered by the Byzantine emperor Heraclius. The caliphate took advantage of Byzantines' exhaustion and captured Egypt ten years after its reconquest by Heraclius.
The Battle of Nikiou was a battle between Arab Muslim troops under General Amr ibn al-A'as and the Byzantine Empire in Egypt in May of 646.
