Autumn – Nikephoros Melissenos, a Byzantine general and aristocrat, seizes control of what remains of Byzantine Asia Minor (modern Turkey ), and proclaims himself emperor against Nikephoros III. Melissenos makes an alliance with Sultan Suleiman ibn Qutulmish and recruits many Turkish mercenaries to his army.

August 1 – King William I ( the Conqueror) calls for a meeting at Old Sarum, where he invites his major vassals and tenants-in-chief to swear allegiance to him. The oath is known as the Oath of Salisbury. The Domesday Book is completed, which is drawn up on the orders of William I.

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.

June 15 – Vratislaus II, a son of Duke Bretislav I, becomes the first king of Bohemia and is elevated 'for life' by Henry IV. Katedralskolan in Lund (modern Sweden ), the oldest school in Scandinavia, is founded by King Canute IV of Denmark.

Robert Guiscard returns with 150 warships in Illyria (modern Albania ), and occupies Corfu and Kefalonia with the support of Ragusa and the Dalmatian cities. King Halsten Stenkilsson is killed and his brother Inge the Elder is deposed in Svealand (modern Sweden ).

Europe. May 12 – Battle of Mailberg: Duke Vratislaus II of Bohemia invades Austria with an army of 8,000 men (supported by mercenaries from Moravia and Bavaria ). He defeats the forces under Margrave Leopold II ( the Fair) near Mailberg. The northern region of Lower Austria is devastated from pillage and famine.