620s

Millennium:	1st millennium
Centuries:	6th century – 7th century – 8th century
Decades:	590s 600s 610s – 620s – 630s 640s 650s
Years:	620 621 622 623 624 625 626 627 628 629
Categories:	Births – Deaths – Architecture Establishments – Disestablishments

The 620s decade ran from January 1, 680, to December 31, 629.

Events and trends

• 627—The Roman-Persian Wars end.
• 622—Year one of the Islamic calendar begins, during which the Hijra occurs—Muhammad and his followers emigrate from Mecca to Medina in September.
• 629, The Byzantine-Arab Wars begin. Much of the Roman Empire is conquered by Muslim Arabs led by Khalid ibn al-Walid.