|Ab urbe condita||1829|
|Balinese saka calendar||997–998|
|English Regnal year||10 Will. 1 – 11 Will. 1|
|Chinese calendar||乙卯年 (Wood Rabbit)|
3772 or 3712
— to —
丙辰年 (Fire Dragon)
3773 or 3713
|- Vikram Samvat||1132–1133|
|- Shaka Samvat||997–998|
|- Kali Yuga||4176–4177|
|Japanese calendar||Jōhō 3|
|Minguo calendar||836 before ROC|
|Seleucid era||1387/1388 AG|
|Thai solar calendar||1618–1619|
1202 or 821 or 49
— to —
1203 or 822 or 50
- January 24 – Synod of Worms: Emperor Henry IV holds a synod in Worms (modern Germany). The assembly declares Pope Gregory VII deposed, and the bishops abandon their allegiance to him.
- February 22 – Gregory VII pronounces a sentence of excommunication against Henry IV at Rome. He is excluded from the Catholic Church, and all the bishops named by Henry are excommunicated.
- Summer – Dirk V, count of Holland, re-conquers West Frisia (modern Netherlands) from the Archdiocese of Utrecht. He besieges Bishop Conrad at the castle of IJsselmonde – taking him prisoner.
- October 8 – Demetrius Zvonimir is crowned as king of Croatia in Solin (near Split), in the Basilica of Saint Peter and Moses (known today as the Hollow Church) by a representative of Gregory VII.
- December 13 – Norman Conquest of Southern Italy: Italo-Norman forces under Robert Guiscard de Hauteville and Richard I of Capua, conquer the fortress city of Salerno – after a short siege.
- December 26 – Bolesław II (the Generous) is crowned as king of Poland by Archbishop Bogumił in the Gniezno Cathedral. Bolesław supports Gregory VII in his conflict against Henry IV.
- May 31 – Waltheof, one of the earls of an uprising against King William I (the Conqueror), is beheaded near Winchester (see Revolt of the Earls).
- The Trial of Penenden Heath is held, with an important ruling regarding land rights, subsequent to the Norman Conquest (approximate date).
- November 1 – In England, a frost begins that lasts until April 1077.
- Koumbi Saleh, an important mercantile and political center of the Ghana Empire (modern Mauritania), is besieged by the Almoravids (approximate date).
- Vikramaditya VI deposes his older brother Someshvara II, and becomes king of the Western Chalukya Empire (modern India).
- Anselm of Aosta, an Italian Benedictine abbot, completes the Monologion (or Monoloque) at the request of his fellow monks.
- March 18 – Ermengarde of Anjou, duchess of Burgundy
- March 21 – Robert I (the Old), duke of Burgundy (b. 1011)
- April 18 – Beatrice of Bar, French duchess and regent
- April 28 – Sweyn II (Estridsson), king of Denmark
- May 8 – Nasr ibn Mahmud, Mirdasid emir of Aleppo
- May 26 – Ramon Berenguer I, count of Barcelona (b. 1023)
- May 31 – Waltheof, earl of Northumbria (executed)
- June 4 – Sancho IV, king of Pamplona (or Navarre)
- July 15 – Arnost (or Arnošt), bishop of Rochester
- Godfrey IV (the Hunchback), duke of Lower Lorraine
- Ramihrdus of Cambrai, French priest and martyr (or 1077)
- William Busac, English nobleman (jure uxoris) (b. 1020)