1020

Year 1020 (MXX) was a leap year starting on Friday (link will display the full calendar) 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
 * 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