|Ab urbe condita||1830|
|Balinese saka calendar||998–999|
|English Regnal year||11 Will. 1 – 12 Will. 1|
|Chinese calendar||丙辰年 (Fire Dragon)|
3773 or 3713
— to —
丁巳年 (Fire Snake)
3774 or 3714
|- Vikram Samvat||1133–1134|
|- Shaka Samvat||998–999|
|- Kali Yuga||4177–4178|
|Japanese calendar||Jōhō 4 / Jōryaku 1|
|Minguo calendar||835 before ROC|
|Seleucid era||1388/1389 AG|
|Thai solar calendar||1619–1620|
1203 or 822 or 50
— to —
1204 or 823 or 51
|Wikimedia Commons has media related to 1077.|
- Fall – Nikephoros Bryennios (the Elder), governor (doux) of the Theme of Dyrrhachium in the western Balkans, and Nikephoros Botaneiates, a general (strategos) of the Theme of Anatolics (modern Turkey), are proclaimed emperors by their troops. Emperor Michael VII (Doukas) offers Bryennios the title of caesar (co-emperor) if he submits to his rule, but Bryennios refuses. He sets out from Dyrrhachium, and marches towards Constantinople.
- January 25 – Walk to Canossa: Emperor Henry IV travels to the Castle of Canossa near Reggio Emilia (Northern Italy), to visit Pope Gregory VII. He waits (with his wife Bertha of Savoy and son Conrad) at the gates for three days, for absolution of his excommunication. Gregory lifts the sentence, imposing on Henry a vow to comply with certain conditions (see Investiture Controversy).
- King Alfonso VI (the Brave) reaches an agreement with his brother Sancho Ramírez, who is elected as king of Navarre. Alfonso annexes the territories of Álava, part of Gipuzkoa and La Bureba, he is crowned and adopts the title of Imperator totius Hispaniae ("Emperor of all Spain").
- April 3 – Henry IV grants the County of Friuli (with ducal status) to Sigaerd of Beilstein, patriarch of Aquileia. He creates the first Parliament, representing the communes as well the nobility and clergy.
- Hugh I, duke of Burgundy, supports Sancho Ramírez (or Sancho V) in his conquest of the Castle of Muñones from Emir Ahmad al-Muqtadir, who rules the Taifa of Zaragoza.
- King Mihailo I is given the title "King of the Slavs" by Gregory VII. He becomes the first recognized ruler of the kingdom of Duklja (modern Montenegro).
- Robert II (Curthose) instigates his first insurrection against his father, King William I (the Conqueror), in Normandy.
- The first recorded trial by combat is held between Wulfstan and Walter.
- August 14 – A fire destroys much of London.
- Suleiman ibn Qutulmish, a cousin of late Sultan Alp Arslan, consolidates his leadership over the Oghuz Turks and founds the Sultanate of Rum (modern Turkey).
- Anushtegin Gharchai becomes governor (shihna) of Khwarezm and a vassal of the Seljuk Empire (until 1097).
- The Bayeux Tapestry (embroidery) is completed, probably in England, possibly to unveil at the dedication of Bayeux Cathedral this year.
- September 1 – Pope Gregory VII appoints Landulf as bishop of Pisa. He makes him permanent legate of the Holy See in Corsica.
- Paul of Caen is installed as abbot of St. Albans in England. He commences the building of St. Albans Abbey Church.
- Pope Christodolos ends his reign as leader of the Coptic Orthodox Church of Alexandria (modern Egypt).
- April 11 – Anawrahta, founder of the Pagan Empire (b. 1014)
- April 25 – Géza I (Magnus), king of Hungary
- October 14 – Andronikos Doukas, Byzantine nobleman
- November 27 – Landulf VI, prince of Benevento
- December 14 – Agnes of Poitou, Holy Roman Empress
- December 21 – Abu'l-Fadl Bayhaqi, Persian historian (b. 995)
- December 27 – Sviatoslav II, Grand Prince of Kiev (b. 1027)
- Eleanor of Normandy, countess of Flanders (b. 1010)
- Minamoto no Takakuni, Japanese nobleman (b. 1004)
- Roussel de Bailleul, Norman warrior and military leader
- Shao Yong, Chinese philosopher and cosmologist (b. 1011)
- Zhang Zai, Chinese philosopher and cosmologist (b. 1020)
- Minguez Fernández, José María (2009). Alfonso VI/Gregorio VII. Soberanía imperial frente a soberanía papal, pp. 30–33. ISSN 1575-801X.
- Canellas, Angel (1951). "Las Cruzadas de Aragon en el Siglo XI". Argensola: Revista de Ciencias Sociales del Instituto de Estudios Altoaragoneses. 7. ISSN 0518-4088. Archived from the original on July 15, 2014. Retrieved February 22, 2012.
- "Fires, Great", in The Insurance Cyclopeadia: Being an Historical Treasury of Events and Circumstances Connected with the Origin and Progress of Insurance, p. 25. Cornelius Walford, ed. (C. and E. Layton, 1876).
- Claude Cahen (1968). Pre-Ottoman Turkey: a general survey of the material and spiritual culture and history c. 1070–1330. Trans. J. Jones-Williams, pp. 73–74 (New York: Taplinger).
- Grape, Wolfgang (1994). The Bayeux tapestry: monument to a Norman triumph. Prestel. ISBN 978-3-7913-1365-8. Retrieved May 3, 2012.
- Cowdrey, H. E. J. (1998). Pope Gregory VII, 1073–1085, p. 279. Oxford: Clarendon Press.