|Covid-19|The Almoravids complete the conquest of the Ghana Empire, and reach Spain.
The Seljuk Turks capture Nicaea.
Suleyman I of Rûm becomes the leader of the Seljuk Sultanate of Rûm in modern Turkey.
Anushtegin Gharchai becomes, as a Seljuk vassal, leader of the Khwarezmid Empire.
January 26 – Walk to Canossa: Henry IV, Holy Roman Emperor, visits Pope Gregory VII as a penitent, asking him to remove sentence of excommunication.
January 28 – The excommunication of Henry IV, Holy Roman Emperor is lifted.
The first Parliament of Friuli is created.
Henry IV, Holy Roman Emperor grants the county of Friuli, with ducal status, to Sigaerd, Patriarch of Aquileia.
Robert Curthose instigates his first insurrection against his father, William the Conqueror, in Normandy.
The kingdom of Duklja is founded.
The first recorded Trial by combat is held in England.
Vsevolod of Kiev becomes the prince of Kievan Rus'.
Alfonso VI of Castile conquers Coria.
Pope Gregory VII places the island of Corsica under the secular rule of the archbishop of Pisa.
Hugh of Burgundy supports the king of Aragon in his conquest of the castle of Muñones from the emir of Zaragossa.
The Bayeux Tapestry is made.
The first English Cluniac Benedictine priory is established, at Lewes.
Paul of Caen is installed as Abbot of St Albans in England; the building of St Albans Abbey Church commences.
Pope Christodolos of Alexandria ends his reign as Coptic Pope.
Dionysius V Lazaros becomes Syriac Orthodox Patriarch of Antioch.
Joseph ibn Migash, rabbi (d. 1141)
April 25 – Géza I of Hungary
Agnes of Poitou, wife of Henry III, Holy Roman Emperor and regent (b. 1020)
King Anawrahta of Burma (b. 1044)
Abu'l-Fadl Bayhaqi, Persian historian and author (b. 995)
Shao Yong, Chinese philosopher, cosmologist, poet and historian (b. 1011)
Zhang Zai, Chinese Neo-Confucian moral philosopher and cosmologist (b. 1020)
Year 1077 (MLXXVII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar.