King Suryavarman I defeats the armies of Udayadityavarman I, eventually becoming ruler of the Khmer Empire.
December – Khalaf I of Sistan surrenders to the Ghaznavids in Taq.
January 8 – Wulfsige III, Bishop of Sherborne, dies and is succeeded by Æthelric.
January 23 – Henry II succeeds Otto III, as King of Germany.
June – Frederick is sent as an imperial legate to the Synod of Pöhlde, to mediate between the claims of Bishop Bernard of Hildesheim, and Willigis, Archbishop of Mainz, concerning the control of Gandersheim Abbey.
July – Battle of Calatañazor: Christian armies of Castille, led by Count Sancho García, and León, led by Alfonso V, defeat invading Muslim forces under Almanzor.
August 8 – Abd al-Malik succeeds Almanzor, chief minister of the Umayyad Caliphate of Córdoba, Spain.
November 13 – St. Brice's Day massacre: English king Æthelred the Unready orders all Danes in England killed.
November – Frederick is elected Archbishop of Ravenna.
Vladivoj succeeds Boleslaus III, Duke of Bohemia.
Otto of Worms withdraws his nomination for the title of Holy Roman Emperor, and receives the Duchy of Carinthia in return.
King Æthelred the Unready of England marries (as his second wife) Emma, daughter of Richard I, Duke of Normandy.
Brian Boru, King of Leinster and Munster, becomes High King of Ireland, breaking the Uí Néill monopoly on the title. Not satisfied with the submission of Máel Sechnaill mac Domnaill, Brian Boru makes an expedition to the north, to take hostages from the northern states.
John IV of Naples is probably released from German captivity by Henry II, Holy Roman Emperor.
With a new group of colonists, an epidemic hits the Viking colony in Greenland.
Danegeld is paid by Æthelred the Unready, to prevent Viking raids against England.
Rafael of Makuria constructs a red brick building in Old Dongola.
June 21 – Pope Leo IX (d. 1054)
Adolf II of Lotharingia (d. 1041)
Al-Khatib al-Baghdadi, Sunni Muslim scholar and historian (d. 1071)
George I of Georgia (possible date; d. 1027)
Mei Yaochen, Chinese poet of the Song dynasty (d. 1060)
January – Sa'id al-Dawla, Hamdanid Emir of Aleppo, poisoned
January 23 – Otto III, Holy Roman Emperor (b. 980)
April 30 – Eckard I, Margrave of Meissen, assassinated
May 6 – Ealdwulf, Archbishop of York, Abbot of Peterborough and Bishop of Worcester
August 8 – Almanzor, chief minister of the Umayyad Caliphate of Córdoba, Spain
October 15 – Otto-Henry, Duke of Burgundy (b. 946)
Pallig, Danish chieftain, Jarl of Devonshire
Gunhilde, wife of Pallig
Godfrey I, Count of Verdun
Rogneda of Polotsk, wife of Vladimir I of Kiev before his conversion to Christianity
Tahir, son of Khalaf I
John the Iberian, Georgian saint
Sancho Ramírez of Viguera
Year 1002 (MII) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar.
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