1081

Millennium:	2nd millennium
Centuries:	10th century 11th century 12th century
Decades:	1060s 1070s 1080s 1090s 1100s
Years:	1078 1079 1080 1081 1082 1083 1084

1081 in various calendars
Gregorian calendar	1081 MLXXXI
Ab urbe condita	1834
Armenian calendar	530 ԹՎ ՇԼ
Assyrian calendar	5831
Balinese saka calendar	1002–1003
Bengali calendar	488
Berber calendar	2031
English Regnal year	15 Will. 1 – 16 Will. 1
Buddhist calendar	1625
Burmese calendar	443
Byzantine calendar	6589–6590
Chinese calendar	庚申年 (Metal Monkey) 3778 or 3571 — to — 辛酉年 (Metal Rooster) 3779 or 3572
Coptic calendar	797–798
Discordian calendar	2247
Ethiopian calendar	1073–1074
Hebrew calendar	4841–4842
Hindu calendars
- Vikram Samvat	1137–1138
- Shaka Samvat	1002–1003
- Kali Yuga	4181–4182
Holocene calendar	11081
Igbo calendar	81–82
Iranian calendar	459–460
Islamic calendar	473–474
Japanese calendar	Jōryaku 5 / Eihō1 (永保元年)
Javanese calendar	985–986
Julian calendar	1081 MLXXXI
Korean calendar	3414
Minguo calendar	831 before ROC 民前831年
Nanakshahi calendar	−387
Seleucid era	1392/1393 AG
Thai solar calendar	1623–1624
Tibetan calendar	阳金猴年 (male Iron-Monkey) 1207 or 826 or 54 — to — 阴金鸡年 (female Iron-Rooster) 1208 or 827 or 55

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.^[1]
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 the city of Avalona (modern Albania); they are joined by several ships from Ragusa, a republic in the Balkans who are enemies of the Byzantines.^[2]
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 attempts to 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 IIofBarcelona, but is turned down. He ends up in the service of Emir Yusuf al-Mu'taman ibn HudofZaragoza.
King Mihailo ("King of the Slavs") dies after a 30-year reign. He is succeeded by his son, Constantine Bodin as ruler of Duklja (until 1101).

Battle of Mynydd Carn (near St. DavidsinWales): 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.^[3]
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 (orChaka 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 CathedralinOdense (modern Denmark).

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