1020

Year 1020 (MXX) was a leap year starting on Friday of the Julian calendar.

Events

• Summer – Emperor Henry II conducts his third Italian military campaign. He makes plans to invade the south, but remains non-committal.
• June 15 – Byzantine troops under Catepan Basil Boioannes (supported by his ally Prince Pandulf IV) capture the fortress of Troia.
• The French city of Saint-Germain-en-Laye is founded by King Robert II (the Pious).
• King Canute the Great codifies the laws of England (approximate date).
• King Gagik I of Armenia is succeeded by Hovhannes-Smbat III.

Births

• Almodis de la Marche, French noblewoman (d. 1071)
• Beatrice of Bar, French duchess and regent (d. 1076)
• Benno II, German bishop and architect (approximate date)
• Bernard of Menthon, French priest and saint (d. 1081)
• Conrad I (or Cuno), duke of Bavaria (approximate date)
• Filarete of Calabria, Sicilian saint (approximate date)
• Gonzalo Sánchez, Spanish nobleman (approximate date)
• Gunhilda of Denmark, German queen (approximate date)
• Guo Xi, Chinese landscape painter (approximate date)
• Hallvard Vebjørnsson, Norwegian saint (approximate date)
• Kunigunde of Altdorf, German noblewoman (approximate date)
• Maria of Gaeta, Italian noblewoman (approximate date)
• Osbern Giffard, Norman nobleman (approximate date)
• Otto of Nordheim, duke of Bavaria (approximate date)
• Stephen IX, pope of the Catholic Church (approximate date)
• Su Song, Chinese statesman and scientist (d. 1101)
• Sweyn Godwinson, English nobleman (approximate date)
• Vladimir Yaroslavich, Grand Prince of Kiev (d. 1052)
• William I (the Great), count of Burgundy (d. 1087)
• William Busac, English nobleman (jure uxoris) (d. 1076)
• William FitzOsbern, 1st Earl of Hereford (approximate date)
• William of Poitiers, French priest and writer (d. 1090)
• Wulfhild of Norway, duchess consort of Saxony (d. 1071)
• Zhang Zai, Chinese philosopher and cosmologist (d. 1077)

Deaths

• June 12 – Lyfing, archbishop of Canterbury<ref>Template:Cite book</ref>
• June 15 – Dattus (or Datto), Lombard rebel leader
• August 16 – Zhou Huaizheng, Chinese eunuch
• Al-Mu'ayyad Ahmad, Muslim imam (b. 944)
• Al-Sijzi, Persian mathematician (approximate date)
• Bernard I (Taillefer), Spanish nobleman
• Bouchard II (the Bearded), French nobleman (b. 975)
• Einar Sigurdsson, Norse Viking nobleman
• Ferdowsi, Persian poet and author (b. 940)
• Gagik I, king of Bagratid Armenia (approximate date)
• Gerald I (Tranche-Lion), French nobleman
• Gojslav, king of Croatia (approximate date)
• Leif Ericson, Norse Viking explorer (approximate date)
• Melus of Bari, Lombard nobleman and rebel leader
• Radim Gaudentius, Polish archbishop (b. 970)
• Stephen I of Vermandois, French nobleman
• Trdat the Architect, Armenian chief architect