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|1080 by topic|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||1833|
|Balinese saka calendar||1001–1002|
|English Regnal year||14 Will. 1 – 15 Will. 1|
|Chinese calendar||己未年 (Earth Goat)|
3776 or 3716
— to —
庚申年 (Metal Monkey)
3777 or 3717
|- Vikram Samvat||1136–1137|
|- Shaka Samvat||1001–1002|
|- Kali Yuga||4180–4181|
|Japanese calendar||Jōryaku 4|
|Minguo calendar||832 before ROC|
|Seleucid era||1391/1392 AG|
|Thai solar calendar||1622–1623|
1206 or 825 or 53
— to —
1207 or 826 or 54
|Wikimedia Commons has media related to 1080.|
- Autumn – Nikephoros Melissenos, an Byzantine general and aristocrat, seizes control of what remains of Byzantine Asia Minor (modern Turkey) and proclaims himself emperor against Nikephoros III. Melissenos makes an alliance with Sultan Suleiman ibn Qutulmish and recruits many Turkish mercenaries to his army.
- January 27 – Battle of Flarchheim: Emperor Henry IV defeats the forces led by the German anti-king Rudolf of Rheinfelden, duke of Swabia, near the town of Flarchheim (modern Germany).
- April 17 – King Harald III dies after an 4-year reign and is buried at Dalby Church in Scania (modern Sweden). He is succeeded by his brother Canute IV ("the Holy") as ruler of Denmark.
- October 14 – Battle on the Elster: Rudolf of Rheinfelden defeats the imperial forces led by Henry IV at the Elster River. Rudolf dies the following day at Merseburg of wounds received.
- May 14 – William Walcher, bishop of Durham, is killed by rebel Northumbrians. King William I ("the Conqueror") sends a punitive expedition led by his half-brother Odo of Bayeux to pacify Northumbria.
- Autumn – Robert Curthose, a son of William I, is sent to invade Scotland. He reaches as far as Falkirk and forces King Malcolm III to agree to terms while building fortifications at Newcastle-on-Tyne.
- Osmund, bishop of Salisbury, builds Devizes Castle in Wiltshire.
- The Rubenid Principality of Cilicia gains independence after its founder, Ruben I, succeeds in establishing his authority in the mountainous regions of Cilicia.
- Shen Kuo, Chinese polymath scientist and statesman, begins his defensive military campaign against the Tanguts of the Western Xia. He successfully defends the invasion route to Yanzhou (Shaanxi province).
- June 25 – Wibert of Ravenna is elected as anti-pope Clement III during the pro-imperial Synod of Brixen. Pope Gregory VII is deposed, signed in a decree by Henry IV.
- King Alfonso VI ("the Brave") of León and Castile establishes Latin liturgy in the Catholic Church, in place of the Hispanic Rite.
- Benno II, bishop of Osnabrück, founds the Benedictine abby of Iburg Castle (modern Germany).
- Adolf III, German count of Berg and Hövel (d. 1152)
- Alberic of Ostia, French cardinal-bishop (d. 1148)
- Barthélemy de Jur, French bishop (approximate date)
- Cellach of Armagh (or Celsus), Irish archbishop (d. 1129)
- Egas Moniz o Aio, Portuguese nobleman (d. 1146)
- Ermesinde of Luxembourg, countess of Namur (d. 1143)
- Guarinus of Palestrina, Italian cardinal-bishop (d. 1158)
- Harald Kesja ("the Spear"), king of Denmark (d. 1135)
- Helie of Burgundy, countess of Toulouse (d. 1141)
- Henry I, archbishop of Mainz (approximate date)
- Honorius Augustodunensis, French theologian (d. 1154)
- Ibn Tumart, Almoravid political leader (approximate date)
- Leo I, prince of Cilician Armenia (approximate date)
- Lhachen Utpala, Indian king of Ladakh (d. 1110)
- Magnus Erlendsson, Norse earl of Orkney (d. 1115)
- María Rodríguez, countess of Barcelona (d. 1105)
- Matilda of Scotland, queen of England (d. 1118)
- Robert Pullen, English cardinal (approximate date)
- Theresa, Portuguese queen and regent (d. 1130)
- Wanyan Zonghan, Chinese nobleman (d. 1136)
- Wulfric of Haselbury, English wonderworker (d. 1154)
- January 26 – Amadeus II, count of Savoy (b. 1050)
- April 17 – Harald III, king of Denmark (b. 1040)
- May 14 – William Walcher, bishop of Durham
- July 5 – Ísleifur Gissurarson, Icelandic bishop (b. 1006)
- October 15 – Rudolf of Rheinfelden, duke of Swabia
- Abraham, bishop of St. David's (approximate date)
- Aristakes Lastivertsi, Armenian historian (b. 1002)
- Bertha of Blois, duchess of Brittany (approximate date)
- Lhachen Gyalpo, Indian king of Ladakh (b. 1050)
- Michael Attaleiates, Byzantine historian and writer
- Muhammad ibn Abbas, ruler of the Ghurid Dynasty
- Brian Todd Carey (2012). Road to Manzikert: Byzantine and Islamic Warfare (527–1071), p. 158. ISBN 978-1-84884-215-1.
- John France. Victory in the East (Book extract).
Godfrey was almost certainly present in support of Henry IV at the battle of Elster in 1080 (sic 1085... an error or typo), when the forces of the anti-king Rudolf triumphed on the field only to see their victory nullified because Rudolf was killed.
- Williams, Hywel (2005). Cassell's Chronology of World History. London: Weidenfeld & Nicolson, pp. 113–114. ISBN 0-304-35730-8.
- Picard C. (1997). La mer et les musulmans d'Occident au Moyen Age. Paris: Presses Universitaires de France.
- Herbert Edward John Cowdrey (1998). Pope Gregory VII, 1073–1085, pp. 201–202 (Oxford University Press).