670

670 in various calendars
Gregorian calendar	670; DCLXX
Ab urbe condita	1423
Armenian calendar	119; ԹՎ ՃԺԹ
Assyrian calendar	5420
Balinese saka calendar	591–592
Bengali calendar	77
Berber calendar	1620
Buddhist calendar	1214
Burmese calendar	32
Byzantine calendar	6178–6179
Chinese calendar	己巳年 (Earth Snake); 3367 or 3160; — to —; 庚午年 (Metal Horse); 3368 or 3161
Coptic calendar	386–387
Discordian calendar	1836
Ethiopian calendar	662–663
Hebrew calendar	4430–4431
Hindu calendars
- Vikram Samvat	726–727
- Shaka Samvat	591–592
- Kali Yuga	3770–3771
Holocene calendar	10670
Iranian calendar	48–49
Islamic calendar	49–50
Japanese calendar	Hakuchi 21; (白雉２１年)
Javanese calendar	561–562
Julian calendar	670; DCLXX
Korean calendar	3003
Minguo calendar	1242 before ROC; 民前1242年
Nanakshahi calendar	−798
Seleucid era	981/982 AG
Thai solar calendar	1212–1213
Tibetan calendar	阴土蛇年; (female Earth-Snake); 796 or 415 or −357; — to —; 阳金马年; (male Iron-Horse); 797 or 416 or −356

Millennium:	1st millennium
Centuries:	6th century; 7th century ; 8th century;
Decades:	650s; 660s; 670s ; 680s; 690s;
Years:	667; 668; 669; 670 ; 671; 672; 673;

Year 670 (DCLXX) was a common year starting on Tuesday of the Julian calendar, the 670th year of the Common Era (CE) and Anno Domini (AD) designations, the 670th year of the 1st millennium, the 70th year of the 7th century, and the 1st year of the 670s decade. The denomination 670 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.

Events

Arab-Byzantine War: The Arab fleet dominates the Aegean Sea and conquers the strategic islands, Rhodes, Cos and Chios. The shore on the southern part of Sea of Marmara is taken, providing an excellent base at Cyzicus to begin the blockade of Constantinople by sea.^[1]

February 15 – King Oswiu of Northumbria dies during a pilgrimage to Rome in the company of bishop Wilfrid.^[2] He is succeeded by his son Ecgfrith, while his youngest son Ælfwine becomes king of Deira. Oswiu is buried at Whitby Abbey, alongside Edwin of Northumbria.

Muslim Conquest: A 10,000-man Arab army under the command of general Uqba ibn Nafi invades the Byzantine Exarchate of Africa. He establishes a military base at Kairouan (Tunisia) for further invasions, and founds the Great Mosque, also known as the "Mosque of Uqba".

Battle of Dafei River: Chinese forces (80,000 men), under general Xue Rengui of the Tang dynasty, are annihilated by the Tibetans, who take over control of the Tarim Basin.
A Goguryeo restoration movement, led by Geom Mojam in northern Korea, places Anseung on the throne. Geom is later murdered, and Anseung flees to neighboring Silla.
Tarumanagara (modern Indonesia) is divided into two kingdoms (Sunda Kingdom and Galuh Kingdom), with the Citarum River as the boundary (approximate date).
A family register, Kogo-nenjaku, is prepared in Japan (approximate date) ^{[Significance of this event is unclear]}.

Hōryū-ji, a Japanese Buddhist temple, burns to the ground after being hit by lightning; its reconstruction is immediately begun.
The diocese of Dorchester-on-Thames in England is replaced by the Diocese of Winchester (approximate date).

^ John Cairns, "Road to Manzikert" (2012). Byzantine Warfare in an Age of Crisis and Recovery (Chapter 3), p. 67. ISBN 978-1-84884-215-1
^ Bede Book IV, Chapter V.