|1066 by topic|
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|Establishments – Disestablishments|
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- Norman conquest of England:
- January 5 – Edward the Confessor of York dies. The Witenagemot proclaims Harold Godwinson King of England.
- January 6 – Harold II is crowned King of England, probably in the new Westminster Abbey.
- January (approx.) – Harold marries Ealdgyth, daughter of Earl Ælfgar, and widow of Welsh ruler Gruffydd ap Llywelyn.
- March 20 – Halley's Comet reaches perihelion. Its appearance is subsequently recorded in the Bayeux Tapestry.
- September 18 – Norwegian king Harald Hardrada lands on the beaches of Scarborough and begins his invasion of England.
- September 20 – Battle of Fulford: Norwegian king Harald Hardrada defeats the northern English earls Edwin and Morcar.
- September 25 – Battle of Stamford Bridge: Word of the Battle of Fulford reaches King Harold Godwinson, who decides to ride north to meet the invaders. Harold defeats Harald Hardrada and his brother Tostig Godwinson.
- September 27 – William the Conqueror and his army set sail from the mouth of the River Somme, beginning the Norman conquest of England.
- September 28 – Duke William of Normandy lands in England at Pevensey.
- October 14 – Battle of Hastings, between King Harold II of England and Duke William of Normandy: Harold is killed by an arrow to the eye (some[who?] say he was killed by a band of Norman knights sent to assassinate him). William is victorious.
- December 25 – Duke William of Normandy is crowned King William I of England in Westminster Abbey.
- December 30 – Granada massacre: A Muslim mob storms the royal palace in Granada, crucifies Jewish vizier Joseph ibn Naghrela, and massacres most of the Jewish population of the city.
- The Republic of Genoa, jealous of the recent successes of its former allies, launches a naval assault on the Republic of Pisa.
- Magnus II Harald's son is crowned King of Norway.
- Upon the death of Stenkil, King of Sweden, two rivals named Eric battle for power in Sweden, both claiming the throne, until the next year.
- Hedeby is destroyed by a Slavic army and permanently abandoned.
- Tain becomes the first town in Scotland to be chartered as a royal burgh.
- Al-Afdal Shahanshah, vizier of the Fatimid caliphs of Egypt (d. 1121)
- Henry, Count of Portugal (d. 1112)
- Irene Doukaina, Byzantine Empress (d. 1138)
- January 5 – King Edward the Confessor
- September 25 (killed at the Battle of Stamford Bridge):
- September 25 – Maria Haraldsdotter, Norwegian princess
- October 14 (killed at the Battle of Hastings):
- November 10 – John Scotus, bishop of Mecklenburg
- Stenkil, king of Sweden since 1060
- Ibn Butlan, Baghdad physician
- Imam Bayhaqi, eminent Islamic scholar