620s explained

The 620s decade ran from January 1, 620, to December 31, 629.

References

Sources

• Web site: Bede . Bede . Book II . . Internet History Sourcebooks Project . . 2021-07-03 . 2011-05-13 . https://web.archive.org/web/20110513234436/http://www.fordham.edu/halsall/basis/bede-book2.html . dead .
• Book: Christian, David . David Christian (historian) . 1999 . A History of Russia, Mongolia and Central Asia . Malden, MA . Blackwell . 978-0-631-20814-3.
  • Book: Kaegi, Walter E. . Walter Kaegi . 2003 . Heraclius: emperor of Byzantium . . 0-521-81459-6.
• Book: [[Sima Guang]]. Zizhi Tongjian (資治通鑑). Comprehensive Mirror for Aid in Government. zh. 1086. .