|Ab urbe condita||1771|
|Balinese saka calendar||939–940|
|English Regnal year||N/A|
|Chinese calendar||丁巳年 (Fire Snake)|
3714 or 3654
— to —
戊午年 (Earth Horse)
3715 or 3655
|- Vikram Samvat||1074–1075|
|- Shaka Samvat||939–940|
|- Kali Yuga||4118–4119|
|Japanese calendar||Kannin 2|
|Minguo calendar||894 before ROC|
|Seleucid era||1329/1330 AG|
|Thai solar calendar||1560–1561|
1144 or 763 or −9
— to —
1145 or 764 or −8
- January 30 – The Peace of Bautzen: Emperor Henry II signs a peace treaty with Bolesław I (the Brave), Duke of Poland, ending the German–Polish War. Poland keeps Lusatia – the Holy Roman Empire keeps Bohemia. With this peace agreement, Bolesław redirects his forces on an offensive against the Kievan Rus'.
- July 22–23 – Battle of the River Bug: Polish forces under Bolesław I defeat Yaroslav the Wise near the River Bug. Yaroslav retreats to Novgorod, abandoning Kiev.
- July 29 – Battle of Vlaardingen: Henry II sends an army towards Holland to subdue the rebellious Count Dirk III. The Imperial forces are defeated near Vlaardingen.
- August – Ivats, Bulgarian nobleman and rebel leader, is blinded and captured by strategos Eustathios Daphnomeles, confirming Bulgaria's position as part of the Byzantine Empire.
- August 14 – Bolesław I accepts the surrender of Kiev by the Pechenegs. He reinstates Sviatopolk I as Grand Prince of Kiev.
- Battle of Cannae: The Lombard adventurer Melus of Bari and his Norman mercenaries are decisively defeated by the Byzantine army, led by the Catepan Basil Boioannes.
- October 1 – Battle of Carham: King Malcolm II of Scotland and Owain Foel (the Bald) are victorious over either Uhtred the Bold or Eadwulf Cudel, rulers of Bamburgh. The battle confirms Scottish dominance over Lothian.
- Cnut the Great travels to Denmark to succeed his brother Harald II on the Danish throne.
- December – Goryeo–Khitan War: Khitan forces of the Liao Dynasty invade Goryeo (North Korea). Goryeo forces led by General Gang Gam-chan annihilates the Khitan army at Kusong.
- April 10 – Nizam al-Mulk, Persian scholar and vizier (d. 1092)
- August 31 – Jeongjong II, ruler of Goryeo (Korea) (d. 1046)
- Abul Hasan Hankari, Abbasid scholar and jurist (d. 1093)
- Bagrat IV, Georgian king of the Bagrationi Dynasty (d. 1072)
- Ermengarde of Anjou, duchess of Burgundy (d. 1076)
- Harthacnut (or Canute III), king of Denmark (d. 1042)
- Michael Psellos, Byzantine monk and philosopher (approximate date)
- Richilde, countess and regent of Flanders (d. 1086)
- Victor II, pope of the Roman Catholic Church (d. 1057)
- February 24 – Borrell, bishop of Vic (Spain)
- February 25 – Arnulf II, archbishop of Milan
- March 22 – Ali ibn Hammud al-Nasir, caliph of Córdoba
- June 23 – Henry I (the Strong), margrave of Austria
- July 7 – Gerberga of Burgundy, duchess of Swabia
- September 25 – Berthold of Toul, German bishop
- October 1
- December 1 – Thietmar, bishop of Merseburg (b. 975)
- Abd al-Rahman IV, Umayyad caliph of Córdoba
- Aeddan ap Blegywryd, king of Gwynedd
- Adolf I of Lotharingia, German nobleman
- Aldhun, bishop of Lindisfarne (or 1019)
- Dragomir, ruler of Travunia and Zachlumia
- Harald II, king and regent of Denmark
- Ivan Vladislav, emperor (tsar) of Bulgaria
- Frederick, German nobleman (b. 974)