The 700s decade ran from January 1, 700, to December 31, 709.
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 660s decade ran from January 1, 660, to December 31, 669.
The 680s decade ran from January 1, 680, to December 31, 689.
Year 634 (DCXXXIV) was a common year starting on Saturday of the Julian calendar. The denomination 634 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 636 (DCXXXVI) was a leap year starting on Monday of the Julian calendar. The denomination 636 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 638 (DCXXXVIII) was a common year starting on Thursday of the Julian calendar. The denomination 638 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 747 (DCCXLVII) was a common year starting on Sunday of the Julian calendar. The denomination 747 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 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 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 643 (DCXLIII) was a common year starting on Wednesday of the Julian calendar. The denomination 643 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 646 (DCXLVI) was a common year starting on Sunday of the Julian calendar. The denomination 646 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 648 (DCXLVIII) was a leap year starting on Tuesday of the Julian calendar. The denomination 648 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 663 (DCLXIII) was a common year starting on Sunday of the Julian calendar. The denomination 663 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.
Constans II, nicknamed "the Bearded", was the Byzantine emperor from 641 to 668. Constans was the last attested emperor to serve as consul, in 642, although the office continued to exist until the reign of Leo VI the Wise. His religious policy saw him steering a middle line in disputes between the Orthodoxy and Monothelitism by refusing to persecute either and prohibited discussion of the natures of Jesus Christ under the Type of Constans in 648. His reign coincided with Muslim invasions under, Umar, Uthman, and Mu'awiya I in the late 640s to 660s. Constans was the first emperor to visit Rome since the fall of the Western Roman Empire in 476, and the last one to visit Rome while it was still held by the Empire.
The Typos of Constans was an edict issued by eastern Roman emperor Constans II in 648 in an attempt to defuse the confusion and arguments over the Christological doctrine of Monotheletism. For over two centuries, there had been a bitter debate regarding the nature of Christ: the orthodox Chalcedonian position defined Christ as having two natures in one person, whereas Miaphysite opponents contended that Jesus Christ possessed but a single nature. At the time, the Byzantine Empire had been at near constant war for fifty years and had lost large territories. It was under great pressure to establish domestic unity. This was hampered by the large number of Byzantines who rejected the Council of Chalcedon in favour of Monophysitism.
