639

639 in various calendars
Gregorian calendar	639; DCXXXIX
Ab urbe condita	1392
Armenian calendar	88; ԹՎ ՁԸ
Assyrian calendar	5389
Balinese saka calendar	560–561
Bengali calendar	46
Berber calendar	1589
Buddhist calendar	1183
Burmese calendar	1
Byzantine calendar	6147–6148
Chinese calendar	戊戌年 (Earth Dog); 3336 or 3129; — to —; 己亥年 (Earth Pig); 3337 or 3130
Coptic calendar	355–356
Discordian calendar	1805
Ethiopian calendar	631–632
Hebrew calendar	4399–4400
Hindu calendars
- Vikram Samvat	695–696
- Shaka Samvat	560–561
- Kali Yuga	3739–3740
Holocene calendar	10639
Iranian calendar	17–18
Islamic calendar	17–19
Japanese calendar	N/A
Javanese calendar	529–530
Julian calendar	639; DCXXXIX
Korean calendar	2972
Minguo calendar	1273 before ROC; 民前1273年
Nanakshahi calendar	−829
Seleucid era	950/951 AG
Thai solar calendar	1181–1182
Tibetan calendar	阳土狗年; (male Earth-Dog); 765 or 384 or −388; — to —; 阴土猪年; (female Earth-Pig); 766 or 385 or −387

Millennium:	1st millennium
Centuries:	6th century; 7th century ; 8th century;
Decades:	610s; 620s; 630s ; 640s; 650s;
Years:	636; 637; 638; 639 ; 640; 641; 642;

Year 639 (DCXXXIX) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 639 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

January 19 – Dagobert I dies after a 10-year reign as king of all the Franks, in which his realm has prospered. He is succeeded by Sigebert III (age 9), independent ruler of Austrasia, and his half-brother Clovis II (age 2), who becomes king of Neustria and Burgundy. Under the supervision of Pepin of Landen, Mayor of the Palace, the royal treasury is distributed between the two brothers and widowed queen Nanthild (regent on Clovis' behalf).

Arab–Byzantine War: The Rashidun army (4,000 men), under the command of 'Amr ibn al-'As, invades Byzantine Egypt. They capture the strategic town of Pelusium (Nile Delta) after a two-month siege. Arab reinforcements led by Zubayr ibn al-Awwam are sent from Medina to assist Amr's army. The losses incurred by the Muslims are ameliorated by Sinai Bedouins, tribes of Rashida and Lakhm;^[1] they join the invaders in conquering Egypt.^[2]
Hormuzan, Persian satrap of Susiana (vassal of the Rashidun Caliphate), revolts against the Muslims and raids Mesopotamia. Arab forces under Abu Musa al-Asha'ari destroy Susa in the lower Zagros Mountains.
Plague of Emmaus: An epidemic disease which has broken out in Emmaus (Imwas) in Palestine strikes the city and the military camps of the Muslim Arabs, killing most of its population (estimated at 25,000 people) until it subsides in October.

The Xueyantuo assaults the Chinese-conquered vassal of Eastern Tujue. Although simultaneously fighting in Korea against Goguryeo, Emperor Tai Zong commissions his famous general Li Shiji to fend off attacks in the campaign against Xueyantuo.
An unsuccessful revolt of Prince Kürşat (of the Eastern Turks) breaks out in China.

Eligius succeeds Acarius as bishop of Doornik and Noyon. He becomes constituted guardian of the towns of Vermandois, which also include Ghent and Kortrijk (Flanders).^[3]
The First Cathedral of Santa Maria Assunta is founded by the exarch Isaac of Ravenna on Torcello, confirming the island's importance as a centre of population in Venice at this date.

^ Al-Maqrizi, Mawaiz wa al-'i'tibar bi dhikr al-khitat wa al-'athar
^ Alfred Butler, "The Invasion of Egypt", p. 213
^ Saint Quen of Rouen; trans. Jo Ann McNamara. "The life of Saint Eligius" (Vita Sanci Eligii)