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|Ab urbe condita||1755|
|Balinese saka calendar||923–924|
|English Regnal year||N/A|
|Chinese calendar||辛丑年 (Metal Ox)|
3698 or 3638
— to —
壬寅年 (Water Tiger)
3699 or 3639
|- Vikram Samvat||1058–1059|
|- Shaka Samvat||923–924|
|- Kali Yuga||4102–4103|
|Japanese calendar||Chōhō 4|
|Minguo calendar||910 before ROC|
|Seleucid era||1313/1314 AG|
|Thai solar calendar||1544–1545|
1128 or 747 or −25
— to —
1129 or 748 or −24
|Wikimedia Commons has media related to 1002.|
- January 23 – Emperor Otto III dies, at the age of 22, of smallpox at Castle of Paterno (near Rome) after a 19-year reign. He leaves no son, nor a surviving brother who can succeed by hereditary right to the throne. Otto is buried in Aachen Cathedral alongside the body of Charlemagne (Charles the Great).
- February 15 – At an assembly at Pavia of Lombard nobles and secondi milites (the minor nobles), Arduin of Ivrea (grandson of former King Berengar II) is restored to his domains and crowned as King of Italy in the Basilica of San Michele Maggiore. Arduin is supported by Arnulf II, archbishop of Milan.
- June 7 – Henry II, a cousin of Otto III, is elected and crowned as King of Germany by Archbishop Willigis at Mainz. Henry does not recognise the coronation of Arduin. Otto of Worms withdraws his nomination for the title of Holy Roman Emperor and receives the Duchy of Carinthia (modern Austria).
- July – Battle of Calatañazor: Christian armies led by Alfonso V of León, Sancho III of Pamplona and Sancho García of Castile, defeat the invading Saracens under Al-Mansur, the de facto ruler of Al-Andalus.
- August 8 – Al-Mansur dies after a 24-year reign and is succeeded by his son Abd al-Malik al-Muzaffar as ruler (hajib) of the Umayyad Caliphate of Córdoba (modern Spain).
- October 15 – Henry I, duke of Burgundy, dies and is succeeded by his stepson, Otto-William. He inherits the duchy, this is disputed by King Robert II (the Pious) of France.
- Fall – A revolt organized by Bohemian nobles of the rivalling Vršovci clan, forces Duke Boleslaus III (the Red) to flee to Germany. He is succeeded by Vladivoj (until 1003).
- November 13 – St. Brice's Day massacre: King Æthelred II (the Unready) orders all Danes in England killed. Æthelred marries (as his second wife) Emma, daughter of Duke Richard I of Normandy.
- Brian Boru, king of Leinster and Munster, becomes High King of Ireland. After the submission of Máel Sechnaill mac Domnaill, Brian Boru makes an expedition to the North.
- Winter – Æthelred II pays tribute (or Danegeld) to Sweyn Forkbeard. He buys him off with a massive payment of 24,000 lbs of silver to hold off Viking raids against England.
- Winter – Khalaf ibn Ahmad, Saffarid emir of Sistan (modern Iran), is deposed and surrenders to the Ghaznavid Dynasty after a 39-year reign (approximate date).
- June – Frederick, archbishop of Ravenna, is sent as an imperial legate to the Synod of Pöhlde, to mediate between the claims of Bishop Bernward of Hildesheim and Willigis, concerning the control of Gandersheim Abbey.
- May 10 – Al-Khatib al-Baghdadi, Muslim scholar (d. 1071)
- June 21 – Leo IX, pope of the Catholic Church (d. 1054)
- Adolf II of Lotharingia, German nobleman (d. 1041)
- Alice of Normandy, countess of Burgundy (d. 1038)
- Aristakes Lastivertsi, Armenian historian (d. 1080)
- George I, king of Georgia (approximate date)
- Mei Yaochen, poet of the Song Dynasty (d. 1060)
- Nikephoros III, Byzantine emperor (d. 1081)
- January 8 – Wulfsige III, bishop of Sherborne
- January 23 – Otto III, Holy Roman Emperor (b. 980)
- April 23 – Æscwig, bishop of Dorchester
- April 30 – Eckard I, margrave of Meissen
- May 6 – Ealdwulf, archbishop of York
- August 8 – Al-Mansur, Umayyad vizier and de facto ruler
- October 15 – Henry I, duke of Burgundy (b. 946)
- November 13
- Athanasius IV, Syrian patriarch of Antioch
- Domonkos I, archbishop of Esztergom
- Gisela, French princess (approximate date)
- Godfrey I (the Prisoner), Frankish nobleman
- John the Iberian, Georgian monk (approximate date)
- Kisai Marvazi, Persian author and poet (b. 953)
- Rogneda of Polotsk, Grand Princess of Kiev (b. 962)
- Sa'id al-Dawla, Hamdanid emir of Aleppo (Syria)
- Sancho Ramírez, king of Viguera (approximate date)