Year 722 (DCCXXII) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. The denomination 722 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.
|Ab urbe condita||1475|
|Balinese saka calendar||643–644|
|Chinese calendar||辛酉年 (Metal Rooster)|
3418 or 3358
— to —
壬戌年 (Water Dog)
3419 or 3359
|- Vikram Samvat||778–779|
|- Shaka Samvat||643–644|
|- Kali Yuga||3822–3823|
|Japanese calendar||Yōrō 6|
|Minguo calendar||1190 before ROC|
|Seleucid era||1033/1034 AG|
|Thai solar calendar||1264–1265|
848 or 467 or −305
— to —
849 or 468 or −304
- Summer – Battle of Covadonga: The Visigothic nobleman Pelagius (Don Pelayo) defeats the Umayyad forces under Munuza, provincial governor of Asturias, at Picos de Europa (near Covadonga). This marks the beginning of the Reconquista, the Christian reconquest of the Iberian Peninsula (or 718).
- King Ine of Wessex attempts a takeover of Dumnonia, but his armies are crushed, and he is forced to withdraw. Queen Æthelburg, wife of Ine, destroys the royal castle of Taunton, to prevent its seizure by rebels under Ealdbert.
- The Battle of Allen is fought close by the Hill of Allen (Ireland) between the Laigin, led by King Murchad mac Brain Mut, and the forces of Fergal mac Máele Dúin (High King of Ireland).
- Battle of Hehil: The West Saxons are defeated by a combined Viking and Cornish army, at Cornovii in Cornwall (approximate date).
- January 3 – King K'inich Ahkal Mo' Naab III takes the throne of the Maya city-state of Palenque (southern Mexico).
- Bush, Robin (1994). Somerset: The Complete Guide. Dovecote Press, pp. 202–206. ISBN 1-874336-26-1
- The Cycles of the Kings - Cath Almaine "The Battle of Allen" Archived September 2, 2006, at the Wayback Machine