1084

Year 1084 (MLXXXIV) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar.

Europe

 * March 31 – Emperor Henry IV besieges Rome and enters the city. He is crowned emperor by Antipope Clement III at Rome and receives the patrician authority.
 * May – Sack of Rome: Duke Robert Guiscard leads a Norman army (36,000 men) north and enters Rome; the city is sacked, and Henry IV is forced to retreat.
 * Robert Guiscard returns with 150 warships in Illyria (modern Albania), and occupies Corfu and Kefalonia with the support of Ragusa and the Dalmatian city-states.
 * King Halsten Stenkilsson is killed and his brother Inge the Elder is deposed in Svealand (modern Sweden). Inge is replaced by his brother-in-law Blot-Sweyn.

Seljuk Empire

 * The Seljuk Turks under Sultan Malik-Shah I conquer Byzantine Antioch, held by Philaretos Brachamios, an Armenian general, who seize power as a usurper.

Asia

 * Sima Guang, Chinese chancellor and historian, with a group of scholars, completes the Zizhi Tongjian, a chronicle of the universal history of China.
 * April 21 – King Kyansittha begins his reign as ruler of the Pagan Kingdom in Burma (modern Myanmar).

Religion

 * Pope Gregory VII, who is imprisoned by Henry IV in Castel Sant'Angelo, is freed by Robert Guiscard. He restores papal authority in Rome.
 * Bruno of Cologne founds the Carthusian Order which includes both monks and nuns. He builds an hermitage in the French Alps.
 * Building work starts on Worcester Cathedral. Orchestrated by Bishop Wulfstan.

Births

 * August 1 – Heonjong, Korean king of Goryeo (d. 1097)
 * Alan I (le Noir), viscount of Rohan (d. 1147)
 * Ali ibn Yusuf, ruler of the Almoravids (d. 1143)
 * Bahram-Shah, ruler of the Ghaznavids (d. 1157)
 * Charles I (the Good), count of Flanders (d. 1127)
 * David I, king of Scotland (approximate date)
 * Li Qingzhao, Chinese female poet and writer
 * Rainier, margrave of Montferrat (approximate date)
 * Rechungpa, Tibetan founder of the Kagyu school (d. 1161)
 * Wang, Chinese empress of the Song Dynasty (d. 1108)

Deaths

 * February 16 – Siegfried I, archbishop of Mainz
 * June 28 – Ekkehard of Huysburg, German abbot
 * October 10 – Gilla Pátraic, bishop of Dublin
 * November 20 – Otto II, margrave of Montferrat
 * Aghsartan I, Georgian king of Kakheti and Hereti
 * Fujiwara no Kenshi, Japanese empress (b. 1057)
 * Halsten Stenkilsson, king of Sweden (approximate date)
 * Herfast (or Arfast), Norman Lord Chancellor
 * Hoël II, duke of Brittany (House of Cornouaille)
 * Saw Lu, king of the Pagan Kingdom (b. 1049)