1177

Year 1177 (MCLXXVII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar.

January–December

 * January – Eystein Meyla, leader of the Birkebeiner in Norway, is killed. Sverre Sigurdson (Later, King Sverre I, of Norway) becomes the new leader.
 * January 13 – Leopold V becomes Duke of Austria.
 * March – Treaty of Venice: Frederick I Barbarossa acknowledges Alexander III as Pope, after a diplomatic mediation by Venetian doge Sebastiano Ziani.
 * March 16 – The Spanish Award is signed and witnessed by, among others, Robert III de Stuteville and John of Greenford
 * August 1 – The Holy Roman Empire renounces any claims on the territory of Rome.
 * September 27 – Pope Alexander III sends a letter to Prester John, believing he is real.
 * November 25 – Battle of Montgisard: Baldwin IV of Jerusalem and Raynald of Chatillon defeat Saladin.

Date unknown

 * During the third year of the Angen era in Japan, a fire devastates Kyoto.
 * During the winter, the Estonians attack Pskov.
 * Casimir II overthrows his brother Mieszko III the Old, to become High Duke of Poland.
 * The Cham sack the Khmer capital of Angkor. The date is disputed.
 * Moscow is burned down by Gleb I, prince of Ryazan, and its inhabitants are killed.
 * A civil war breaks out in the Republic of Florence, between the Uberti Family and their consular opponent.
 * Puigcerdà is founded by Alfonso II of Aragon.
 * Byland Abbey is established on its final site in Yorkshire, England, by the Cistercians.
 * Abbas Benedictus becomes abbot of Peterborough in England.
 * Roger de Moulins becomes Grand Master of the Knights Hospitaller.
 * possible date – Richard FitzNeal begins to write his treatise Dialogus de Scaccario ("Dialogue concerning the Exchequer") in England.
 * The union of Egypt and Syria under Sultan Saladin Yusuf ibn Ayyub, the foundation of the Ayyubid Sultanate.

Births

 * February/March – Philip of Swabia, rival of Otto IV, Holy Roman Emperor (d. 1208)
 * August – Baldwin V, King of Jerusalem (d. 1186)
 * Marie of Oignies, French beguin (d. 1213)
 * Sylvester Gozzolini, Italian founder of the Sylvestrines (d. 1267)

Deaths

 * January 13 – Henry II, Duke of Austria (b. 1107)
 * January – Eystein Meyla, leader of the Birkebeiner in Norway. (b. 1157)
 * June – William of Montferrat, Count of Jaffa and Ascalon, father of Baldwin V of Jerusalem (b. early 1140s)
 * probable – Hugh Bigod, 1st Earl of Norfolk (b. 1095)