|Ab urbe condita||1784|
|Balinese saka calendar||952–953|
|English Regnal year||N/A|
|Chinese calendar||庚午年 (Metal Horse)|
3727 or 3667
— to —
辛未年 (Metal Goat)
3728 or 3668
|- Vikram Samvat||1087–1088|
|- Shaka Samvat||952–953|
|- Kali Yuga||4131–4132|
|Japanese calendar||Chōgen 4|
|Minguo calendar||881 before ROC|
|Seleucid era||1342/1343 AG|
|Thai solar calendar||1573–1574|
1157 or 776 or 4
— to —
1158 or 777 or 5
|Wikimedia Commons has media related to 1031.|
- July 20 – King Robert II (the Pious) dies at Melun after a 35-year reign. He is succeeded by his 23-year-old son, Henry I, who becomes the sole ruler of France. Henry's mother, Queen dowager Constance of Arles prefers her third son, Robert, as heir to the throne and, with the help of Count Odo II, begins a war against Henry.
- The Caliphate of Córdoba collapses after years of infighting, the caliphate fractures into a number of independent Muslim taifa (kingdoms). The last Umayyad ruler, Caliph Hisham III, tries to consolidate the caliphate, but his raising of taxes (to pay for mosques) leads to heavy opposition and he is imprisoned by his rivals.
- King Mieszko II is forced to escape Poland after an attack of Grand Prince Yaroslav I (the Wise) of Kiev, who installs Mieszko's half-brother Bezprym onto the Polish throne.
- France suffers from a famine (until 1033).
- March 26 – Malcolm III (Canmore), king of Scotland (d. 1093)
- Hoël II (or Houel), duke of Brittany (approximate date)
- Matilda of Flanders, queen consort of England (d. 1083)
- Muhammad ibn Ammar, Moorish poet and writer (d. 1086)
- Robert, Norman nobleman and Earl of Cornwall (d. 1095)
- Roger I (the Great Count), Norman nobleman (d. 1101)
- Shen Kuo, Chinese polymath scientist and engineer (d. 1095)
- Spytihněv II, duke of Bohemia (House of Přemyslid) (d. 1061)
- January 1 – William of Volpiano, Italian abbot (b. 962)
- January 5 – Gunnor, duchess consort of Normandy
- April 10 – Liudolf of Lotharingia, German nobleman
- June 17 – Hyeonjong, king of Goryeo (Korea) (b. 992)
- June 25 – Sheng Zong, emperor of the Liao Dynasty (b. 972)
- June 28 – Taira no Tadatsune, Japanese governor (b. 975)
- July 20 – Robert II (the Pious), king of France (b. 972)
- August 20 – Burchard, French archbishop and count
- September 2 – Emeric, Hungarian prince and co-heir
- September 9 – Gang Gam-chan, Korean general (b. 948)
- November 29 – Al-Qadir, Abbasid caliph of Baghdad (b. 947)
- Aribo, German archbishop and primate (Primas Germaniae)
- Fadl ibn Muhammad, Shaddadid emir of Ganja (Azerbaijan)
- Qadi 'Abd al-Wahhab, Abbasid scholar and jurist (b. 973)
- Snorri Goði, Icelandic Viking warrior and chieftain (b. 963)
- Jonathan Riley-Smith (2006). The New Cambridge Medieval History, Volume 4, c. 1024–c. 1198, p. 124. ISBN 978-0-521-41411-1.
- Chejne, Anwar G. (1974). Muslim Spain: Its History and Culture, pp. 43–49. Minneapolis: The University of Minnesota Press. ISBN 0816606889.
- Moriceau, Jean-Marc (2011) L'Homme contre le loup. Une guerre de deux mille ans, Paris, Fayard.