| Millennium: | 2nd millennium | 
|---|---|
| Centuries: | |
| Decades: | |
| Years: | 
| 1020 by topic | 
|---|
| Leaders | 
  | 
| Birth and death categories | 
| Births – Deaths | 
| Establishments and disestablishments categories | 
| Establishments – Disestablishments | 
| Gregorian calendar | 1020 MXX  | 
| Ab urbe condita | 1773 | 
| Armenian calendar | 469 ԹՎ ՆԿԹ  | 
| Assyrian calendar | 5770 | 
| Balinese saka calendar | 941–942 | 
| Bengali calendar | 427 | 
| Berber calendar | 1970 | 
| English Regnal year | N/A | 
| Buddhist calendar | 1564 | 
| Burmese calendar | 382 | 
| Byzantine calendar | 6528–6529 | 
| Chinese calendar | 己未年 (Earth Goat) 3717 or 3510 — to — 庚申年 (Metal Monkey) 3718 or 3511  | 
| Coptic calendar | 736–737 | 
| Discordian calendar | 2186 | 
| Ethiopian calendar | 1012–1013 | 
| Hebrew calendar | 4780–4781 | 
| Hindu calendars | |
| - Vikram Samvat | 1076–1077 | 
| - Shaka Samvat | 941–942 | 
| - Kali Yuga | 4120–4121 | 
| Holocene calendar | 11020 | 
| Igbo calendar | 20–21 | 
| Iranian calendar | 398–399 | 
| Islamic calendar | 410–411 | 
| Japanese calendar | Kannin 4 (寛仁4年)  | 
| Javanese calendar | 922–923 | 
| Julian calendar | 1020 MXX  | 
| Korean calendar | 3353 | 
| Minguo calendar | 892 before ROC 民前892年  | 
| Nanakshahi calendar | −448 | 
| Seleucid era | 1331/1332 AG | 
| Thai solar calendar | 1562–1563 | 
| Tibetan calendar | 阴土羊年 (female Earth-Goat) 1146 or 765 or −7 — to — 阳金猴年 (male Iron-Monkey) 1147 or 766 or −6  | 
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
 
References
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