622

Millennium:	1st millennium
Centuries:	6th century – 7th century – 8th century
Decades:	590s 600s 610s – 620s – 630s 640s 650s
Years:	619 620 621 – 622 – 623 624 625

622 by topic
Politics
State leaders – Sovereign states
Birth and death categories
Births – Deaths
Establishment and disestablishment categories
Establishments – Disestablishments

622 in other calendars
Gregorian calendar	622 DCXXII
Ab urbe condita	1375
Armenian calendar	71 ԹՎ ՀԱ
Assyrian calendar	5372
Bengali calendar	29
Berber calendar	1572
Buddhist calendar	1166
Burmese calendar	−16
Byzantine calendar	6130–6131
Chinese calendar	辛巳年 (Metal Snake) 3318 or 3258 — to — 壬午年 (Water Horse) 3319 or 3259
Coptic calendar	338–339
Discordian calendar	1788
Ethiopian calendar	614–615
Hebrew calendar	4382–4383
Hindu calendars
- Vikram Samvat	678–679
- Shaka Samvat	544–545
- Kali Yuga	3723–3724
Holocene calendar	10622
Iranian calendar	0–1
Islamic calendar	0–1
Japanese calendar	N/A
Julian calendar	622 DCXXII
Korean calendar	2955
Minguo calendar	1290 before ROC 民前1290年
Seleucid era	933/934 AG
Thai solar calendar	1164–1165

Wikimedia Commons has media related to 622.

Year 622 (DCXXII) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 622 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

Byzantine–Sassanid War: Emperor Heraclius sails from Constantinople with an expeditionary force (probably 50,000 men) and starts a counter-offensive against the Persian Empire. His young son, Constantine III, is left behind as regent under the charge of Sergius I, patriarch of Constantinople, and patrician Bonus. He lands a few days later at the junction of Cilicia and Syria, near Alexandretta and ancient Issus.
Battle of Issus: Heraclius defeats the Persian forces under Shahrbaraz in Cappadocia. He recaptures Anatolia, but returns to Constantinople to deal with the threat pose to his Balkan domains by the Avars and puts the Byzantine army into winter quarters in Pontus.^[1]

The Western Turks conquer the Oxus valley and cooperate with Heraclius against Persia, taking Khorasan (modern Afghanistan).

June 10 – The Islamic prophet Muhammad, after being warned of a plot to assassinate him, secretly leaves his home in Mecca to emigrate to Yathrib (later renamed by him to Medina) along with his companion Abu Bakr. They take refuge in the Cave of Thawr south of Mecca for three days.
June 24 – Muhammad does not enter Yathrib directly, but stops at its outlying environs of Quba. He establishes the Quba Mosque there, the first mosque of Islam. On June 28, he makes his first visit to Yathrib for Friday prayers.
July 8 – After a fourteen days’ stay in Quba, Muhammad finally moves from Quba to Yathrib, and is greeted cordially by its people. There he drafts the Constitution of Medina, which constitutes an agreement between the various Muslim, Jewish, Christian, and pagan tribal communities in the city, and forms the basis of a multi-religious Islamic state. Later during the caliphate of Umar in 638, the lunar year during which the emigration to Medina occurred (Friday, 16 July 622 – 4 July 623) was designated "Year One" of the new Anno Hegirae (AH).^[2]
Xuanzang is fully ordained as a Buddhist monk at the age of 20.^[3]

↑ Kaegi 2003, p. 116
↑ F. A. Shamsi, "The Date of Hijrah", Islamic Studies 23 (1984): 189-224, 289-323.
↑ Howgego, Raymond John (2003). Encyclopedia of exploration to 1800. Hordern House. p. 522. ISBN 978-1-875567-36-2.
↑ Illustrated Dictionary of the Muslim World. Marshall Cavendish. 2010. pp. 122–123. ISBN 978-0-7614-7929-1.
↑ DeBlasi, Anthony (2002). Reform in the balance: the defense of literary culture in mid-Tang China. SUNY Press. p. 170. ISBN 978-0-7914-5436-7.
↑ Holtzclaw, R. Fulton (1980). The Saints Go Marching In. Keeble Press. p. 24.
↑ Woo, X. L. (2008). "622#v=onepage&q&f=false Empress Wu the Great: Tang Dynasty China. Algora Publishing. p. 19. ISBN 978-0-87586-660-4.
↑ The New Encyclopædia Britannica: Micropædia (15th ed.). Encyclopædia Britannica, Inc. 1991. p. 765. ISBN 978-0-85229-529-8.