Editing 622 (section)

== Events ==
<onlyinclude>

=== By place ===

==== Byzantine Empire ====
* [[Byzantine–Sasanian War of 602–628#Byzantine counter-offensive|Byzantine–Sasanian War]]: Emperor [[Heraclius]] sails from [[Constantinople]] with an expeditionary force (probably 50,000 men), and starts a counter-offensive against the [[Sasanian Empire|Persian Empire]] (his young son, [[Constantine III (Byzantine emperor)|Constantine III]], is left behind as [[Regency (government)|regent]] under the charge of [[Sergius I of Constantinople|Sergius I]], [[Ecumenical Patriarch of Constantinople|patriarch of Constantinople]], and patrician [[Bonus (patrician)|Bonus]]). He lands a few days later at the junction of [[Cilicia]] and [[Syria]], near [[İskenderun|Alexandretta]] and ancient [[Issus (town)|Issus]].
* [[Heraclius' campaign of 622|Battle of Issus]]: Heraclius defeats the Persian forces under [[Shahrbaraz]] in [[Cappadocia]]. He recaptures [[Anatolia]], but returns to Constantinople to deal with the threat posed to his [[Balkans|Balkan]] domains by the [[Avars (Carpathians)|Avars]], and puts the [[Byzantine army]] into winter quarters in [[Pontus (region)|Pontus]].{{sfn|Kaegi|2003|p=116}}

==== Asia ====
* The [[Western Turkic Khaganate|Western Turks]] conquer the [[Amu Darya|Oxus valley]] and cooperate with Heraclius against [[Iran|Persia]], taking [[Greater Khorasan|Khorasan]] (modern [[Afghanistan]]).

====Central America====
*[[March 28]] &ndash; [[Tajoom Ukʼab Kʼahkʼ]] becomes the [[Maya rulers|ruler of the Mayan city state]] of [[Calakmul]] in southern [[Mexico]] and reigns until [[630]].

=== By topic ===

==== Religion ====
* [[September 9]]<ref name=Shamsi>{{cite journal|first=F. A.|last=Shamsi|title=The Date of Hijrah|journal=Islamic Studies|volume=23|year=1984|pages=189–224, 289–323}}</ref> or [[June 17]]<ref name=FazlurRehman51>{{cite book|last=Shaikh|first=Fazlur Rehman|title=Chronology of Prophetic Events|year=2001|publisher=Ta-Ha Publishers|location=London|pages=51–52}}</ref> &ndash; The [[Prophets and messengers in Islam|Islamic prophet]] [[Muhammad]], after being commanded by God Almighty, secretly leaves his home in [[Mecca]] to make the [[Hijrah]] (emigrate) to Yathrib (later renamed by him [[Medina]]), along with his [[Sahabah|companion]] [[Abu Bakr]]. They take refuge in the [[Cave of Thawr]] south of Mecca for three days, departing on September 13 or June 21.
* [[September 20]]<ref name=Shamsi/> or [[June 28]]<ref name=FazlurRehman51/> &ndash; Muhammad does not enter Yathrib directly, but stops at its outlying environs of Quba. He establishes the [[Quba Mosque]] here, the first mosque of Islam. On July 2 (or September 24) he makes his first visit to Yathrib for Friday prayers.
* [[October 4]]<ref name=Shamsi/> or [[July 13]] &ndash; After a fourteen days' stay in Quba, Muhammad finally moves from Quba to Yathrib, and is greeted cordially by its people. Here he drafts the [[Constitution of Medina]], an agreement between the various Muslim, Jewish, Christian and pagan tribal communities in the city, forming the basis of a multi-religious Islamic state, and begins construction of the [[Al-Masjid an-Nabawi]] Mosque. 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) is designated "Year One" of the new [[Hijri year|Hijri era]] (''Anno Hegirae'' &ndash; AH).
* [[Xuanzang]] is fully ordained as a [[Bhikkhu|Buddhist monk]] at the age of 20.<ref>{{cite book|last=Howgego|first=Raymond John|title=Encyclopedia of Exploration to 1800|year=2003|publisher=Hordern House|isbn=978-1-875567-36-2|page=522|url=https://books.google.com/books?id=nFIRAQAAMAAJ&q=c.622}}</ref>