644

For highways with this number, see List of highways numbered 644.

(DCXLIV) was a leap year starting on Thursday of the Julian calendar. The denomination 644 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.

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 (644–651)

Year 665

Events

By place

Asia

• Emperor Taizong of the Tang dynasty sends a Chinese expeditionary force, to invade and annex the Tarim Basin kingdom of Karasahr in Xinjiang, a vassal of the Western Turkic Khaganate. The oasis state is conquered, and Western Turks sent to assist Karasahr are defeated by the Tang forces.^[1]
• Zenkoji, a Buddhist temple and landmark spot in Nagano, Japan, is officially built by Empress Kogyoku.^{[citation needed]}

Britain

• Oswine, son of the late king Osric of Deira, manages to establish himself as king of Deira (Northern England) despite armed objections from King Oswiu of Bernicia. His succession, probably the choice of the people of Deira, splits the Kingdom of Northumbria.^[2]

Byzantine Empire

• Valentinus, Byzantine general, attempts to usurp the throne of his son-in-law Constans II. He appears at the gates of Constantinople with a contingent of Byzantine troops, and demands to be crowned emperor. His claim is rejected, and Valentinus is lynched by the populace.^[3]

Islamic Empire

• November 3 – The second caliph Umar, r. 634–644, dies of wounds inflicted by the Persian slave Abu Lu'lu'a Firuz at Medina. On his death bed he appoints a committee to determine his successor. They select Uthman ibn Affan, who becomes the third caliph of the Rashidun Caliphate.

Births

• K'inich K'an Joy Chitam II, ruler of Palenque
• Li Jiao, chancellor of the Tang dynasty (d. 713)

Deaths

• January 17 – Sulpitius the Pious, French bishop and saint
• October 10 – Paulinus, Archbishop of York^[4]
• Otto, mayor of the palace (Austrasia)
• Radulf, king of Thuringia (approximate date)
• Trudpert, Irish missionary (or 607)
• Abu Lu'lu'a Firuz, assassin of Umar I
• Umar I, Muslim caliph (r. 634–644)
• Valentinus, Byzantine general and usurper