# 644

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Calendar year

For highways with this number, see [List of highways numbered 644](/source/List_of_highways_numbered_644).

Calendar year

Years Millennium 1st millennium Centuries 6th century 7th century 8th century Decades 620s 630s 640s 650s 660s Years 641 642 643 644 645 646 647 v t e

644 by topic Leaders Political entities State leaders Religious leaders Categories Births Deaths Establishments v t e

644 in various calendars Gregorian calendar 644 DCXLIV Ab urbe condita 1397 Armenian calendar 93 ԹՎ ՂԳ Assyrian calendar 5394 Balinese saka calendar 565–566 Bengali calendar 50–51 Berber calendar 1594 Buddhist calendar 1188 Burmese calendar 6 Byzantine calendar 6152–6153 Chinese calendar 癸卯年 (Water Rabbit) 3341 or 3134 — to — 甲辰年 (Wood Dragon) 3342 or 3135 Coptic calendar 360–361 Discordian calendar 1810 Ethiopian calendar 636–637 Hebrew calendar 4404–4405 Hindu calendars - Vikram Samvat 700–701 - Shaka Samvat 565–566 - Kali Yuga 3744–3745 Holocene calendar 10644 Iranian calendar 22–23 Islamic calendar 23–24 Japanese calendar N/A Javanese calendar 535–536 Julian calendar 644 DCXLIV Korean calendar 2977 Minguo calendar 1268 before ROC 民前1268年 Nanakshahi calendar −824 Seleucid era 955/956 AG Thai solar calendar 1186–1187 Tibetan calendar ཆུ་མོ་ཡོས་ལོ་ (female Water-Hare) 770 or 389 or −383 — to — ཤིང་ཕོ་འབྲུག་ལོ་ (male Wood-Dragon) 771 or 390 or −382

King [Oswine of Deira](/source/Oswine_of_Deira) (644–651)

Year **644** (**[DCXLIV](/source/Roman_numerals)**) was a [leap year starting on Thursday](/source/Leap_year_starting_on_Thursday) of the [Julian calendar](/source/Julian_calendar). The denomination 644 for this year has been used since the early medieval period, when the [Anno Domini](/source/Anno_Domini) [calendar era](/source/Calendar_era) became the prevalent method in Europe for naming years.

## Events

### By place

#### Asia

- Emperor [Taizong](/source/Emperor_Taizong_of_Tang) of the [Tang dynasty](/source/Tang_dynasty) sends a Chinese expeditionary force, to [invade and annex](/source/Tang_campaigns_against_Karasahr) the [Tarim Basin](/source/Tarim_Basin) kingdom of [Karasahr](/source/Karasahr) in [Xinjiang](/source/Xinjiang), a vassal of the [Western Turkic Khaganate](/source/Western_Turkic_Khaganate). The [oasis](/source/Oasis) state is conquered, and Western Turks sent to assist Karasahr are defeated by the Tang forces.[1]

- [Zenkoji](/source/Zenkoji), a [Buddhist temple](/source/Buddhist_temple) and landmark spot in [Nagano](/source/Nagano_(city)), Japan, is officially built by [Empress Kogyoku](/source/Empress_Kogyoku).[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

#### Britain

- [Oswine](/source/Oswine_of_Deira), son of the late king [Osric of Deira](/source/Osric_of_Deira), manages to establish himself as king of [Deira](/source/Deira) ([Northern England](/source/Northern_England)) despite armed objections from King [Oswiu of Bernicia](/source/Oswiu_of_Northumbria). His succession, probably the choice of the people of Deira, splits the [Kingdom of Northumbria](/source/Kingdom_of_Northumbria).[2]

#### Byzantine Empire

- [Valentinus](/source/Valentinus_(usurper)), Byzantine general, attempts to usurp the [throne](/source/Throne) of his son-in-law [Constans II](/source/Constans_II). He appears at the gates of [Constantinople](/source/Constantinople) with a contingent of Byzantine troops, and demands to be crowned emperor. His claim is rejected, and Valentinus is [lynched](/source/Lynching) by the populace.[3]

#### Islamic Empire

- [November 3](/source/November_3) – The second caliph [Umar](/source/Umar), r. 634–644, dies of wounds inflicted by the Persian slave [Abu Lu'lu'a Firuz](/source/Abu_Lu'lu'a_Firuz) at [Medina](/source/Medina). On his death bed he appoints a committee to determine his successor. They select [Uthman ibn Affan](/source/Uthman_ibn_Affan), who becomes the third [caliph](/source/Caliph) of the [Rashidun Caliphate](/source/Rashidun_Caliphate).

## Births

- [K'inich K'an Joy Chitam II](/source/K'inich_K'an_Joy_Chitam_II), ruler of [Palenque](/source/Palenque)

- [Li Jiao](/source/Li_Jiao_(Tang_dynasty)), chancellor of the [Tang dynasty](/source/Tang_dynasty) (d. [713](/source/713))

## Deaths

- [January 17](/source/January_17) – [Sulpitius the Pious](/source/Sulpitius_the_Pious), French bishop and saint

- [October 10](/source/October_10) – [Paulinus](/source/Paulinus_of_York), [Archbishop of York](/source/Archbishop_of_York)[4]

- [Otto](/source/Otto_(mayor_of_the_palace)), [mayor of the palace](/source/Mayor_of_the_palace) ([Austrasia](/source/Austrasia))

- [Radulf](/source/Radulf%2C_King_of_Thuringia), king of [Thuringia](/source/Thuringia) (approximate date)

- [Trudpert](/source/Trudpert), Irish [missionary](/source/Missionary) (or [607](/source/607))

- [Abu Lu'lu'a Firuz](/source/Abu_Lu'lu'a_Firuz), assassin of Umar I

- [Umar I](/source/Umar), Muslim [caliph](/source/Caliph) (r. 634–644)

- [Valentinus](/source/Valentinus_(usurper)), Byzantine general and [usurper](/source/Usurper)

## References

1. **[^](#cite_ref-1)** Wechsler, Howard J. (1979). "T'ai-tsung (reign 626–49) the consolidator". In Twitchett, Dennis (ed.). *The Cambridge History of China, Volume 3: Sui and T'ang China, 589–906, Part I*. Cambridge: Cambridge University Press. p. 226. [ISBN](/source/ISBN_(identifier)) [978-0-521-21446-9](https://en.wikipedia.org/wiki/Special:BookSources/978-0-521-21446-9).

1. **[^](#cite_ref-parker_2-0)** [Parker, Anselm. "St. Oswin". The Catholic Encyclopedia. Vol 11. New York: Robert Appleton Company, 1911. 28 Mar. 2013](http://www.newadvent.org/cathen/11349a.htm)

1. **[^](#cite_ref-3)** [Lilie, Ralph-Johannes](/source/Ralph-Johannes_Lilie); Ludwig, Claudia; Pratsch, Thomas; Zielke, Beate (2001). "Ualentinos (#8545)". *Prosopographie der mittelbyzantinischen Zeit: 1. Abteilung (641–867), Band 5 : Theophylaktos (# 8346) – az-Zubair (# 8675), Anonymi (# 10001–12149)* (in German). Berlin and Boston: De Gruyter. p. 71. [ISBN](/source/ISBN_(identifier)) [978-3-11-016675-0](https://en.wikipedia.org/wiki/Special:BookSources/978-3-11-016675-0).

1. **[^](#cite_ref-Handbook221_4-0)** Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I. (1996). *Handbook of British Chronology* (Third revised ed.). Cambridge University Press. p. 221. [ISBN](/source/ISBN_(identifier)) [0-521-56350-X](https://en.wikipedia.org/wiki/Special:BookSources/0-521-56350-X).

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Adapted from the Wikipedia article [644](https://en.wikipedia.org/wiki/644) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/644?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.