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|1081 by topic|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||1834|
|Balinese saka calendar||1002–1003|
|English Regnal year||15 Will. 1 – 16 Will. 1|
|Chinese calendar||庚申年 (Metal Monkey)|
3777 or 3717
— to —
辛酉年 (Metal Rooster)
3778 or 3718
|- Vikram Samvat||1137–1138|
|- Shaka Samvat||1002–1003|
|- Kali Yuga||4181–4182|
|Japanese calendar||Jōryaku 5 / Eihō 1|
|Minguo calendar||831 before ROC|
|Seleucid era||1392/1393 AG|
|Thai solar calendar||1623–1624|
1207 or 826 or 54
— to —
1208 or 827 or 55
|Wikimedia Commons has media related to 1081.|
- April 1 – Emperor Nikephoros III is forced to abdicate the throne and retires to the Peribleptos monastery. He is succeeded by Alexios I Komnenos, who is crowned on April 5, as ruler of the Byzantine Empire. His brother-in-law Nikephoros Melissenos supports Alexios as new emperor in exchange for the title of Caesar (co-emperor) and is appointed as commander of the Byzantine armies in the West.
- May – A Norman fleet of 150 ships (including 60 horse transports), led by Duke Robert Guiscard, sets off towards the Dalmatian coast. An army of 15,000 men (including about 1,300 Norman knights) sails to city of Avalona (modern Albania); they are joined by several ships from Ragusa, a republic in the Balkans who are enemies of the Byzantines.
- October 18 – Battle of Dyrrhachium: After taking the island of Corfu, Robert Guiscard advances to Dyrrhachium (modern-day Durrës), and lays siege to the city. Alexios I Komnenos supports defend Illyria from the Normans (the first recorded mention of Albania), but is defeated by Guiscard, outside Dyrrhachium, the Byzantine capital city of Illyria.
- King Alfonso VI (the Brave) of Castile exiles his most famous commander, Rodrigo Díaz de Vivar (El Cid), who goes into exile and offers his services to the twins – Counts Ramon Berenguer II and Berenguer Ramon II of Barcelona, but is turned down. He ends up in the service of Emir Yusuf al-Mu'taman ibn Hud of Zaragoza.
- Battle of Mynydd Carn (near St. Davids in Wales): Gruffudd ap Cynan in alliance with Rhys ap Tewdwr, prince of Deheubarth, defeats the forces of Trahaearn ap Caradog, Caradog ap Gruffydd and Meilir ap Rhiwallon (who are all killed), allowing Gruffudd to claim the Kingdom of Gwynedd.
- King William I (the Conqueror) orders the creation of a castle at Cardiff during his tour of southern Wales. The first castle on the site would be a motte and bailey type and is built on existing Roman fortifications.
- Seljuk emir Tzachas (or Chaka Bey) conquers Smyrna (modern-day İzmir) and founds a short-lived independent state, which emerges as the first sea power in Turkish history.
- Pope Gregory VII writes a letter to Hermann, bishop of Metz, about the behavior of Emperor Henry IV (approximate date).
- Construction begins on St. Canute's Cathedral in Odense (modern Denmark).
- Louis VI (the Fat), king of France (approximate date)
- Rudolf I, count of Bregenz and Chur (d. 1160)
- Satake Masayoshi, Japanese samurai (d. 1147)
- Suger, French abbot and historian (d. 1151)
- William I, count of Luxembourg (d. 1131)
- Zhang Bangchang, Chinese prime minister (d. 1127)
- Zhao Mingcheng, Chinese scholar-official (d. 1129)
- September 1 – Eusebius (or Bruno), bishop of Angers
- October 18
- December 10 – Nikephoros III, Byzantine emperor
- Abelard of Hauteville, Italo-Norman nobleman
- Abu al-Walid al-Baji, Moorish scholar and poet (b. 1013)
- Artau I, count of Pallars Sobirà (approximate date)
- Bernard of Menthon, French priest and saint
- Bolesław II (the Generous), king of Poland (or 1082)
- Caradog ap Gruffydd, prince of Gwent
- Ibn Hayyus, Syrian poet and panegyrist (b. 1003)
- Jōjin, Japanese Tendai monk and writer (b. 1011)
- Trahaearn ap Caradog, king of Gwynedd (b. 1044)