1177

1177 (MCLXXVII) was a common year starting on Saturday of the Julian calendar, the 1177th year of the Common Era (CE) and Anno Domini (AD) designations, the 177th year of the 2nd millennium, the 77th year of the 12th century, and the 8th year of the 1170s decade. As of the start of 1177, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.

• November 25 — Baldwin IV of Jerusalem and Raynald of Chatillon beat Saladin at the Battle of Montgisard.
• During the third year of the Angen era in Japan, a fire devastates Kyoto.
• Benedictus Abbas becomes abbot of Peterborough.
• Byland Abbey is started in Yorkshire by the Cistercians.
• Casimir II becomes duke of Poland.
• The Cham sack the Khmer capital of Angkor Wat.
• Roger de Moulins becomes Grand Master of the Knights Hospitaller.
• Moscow is burned down.
• Puigcerdà is founded by Alfonso II of Aragon.
• Leopold V becomes Duke of Austria.
• September 27 — Pope Alexander III sends a letter to Prester John, believing he is real.
• Treaty of Venice — Frederick I Barbarossa accepts Alexander III as Pope
• Estonians attack Pskov during winter.

• Baldwin V, king of Jerusalem (d. 1186)
• Robert de Ros, English baron (d. 1226)
• Philip of Swabia, enemy of Otto IV, Holy Roman Emperor (d. 1208)

• January 13 — Henry II of Austria (b. 1107)
• William of Montferrat, Count of Jaffa and Ascalon, father of Baldwin V of Jerusalem (b. early 1140s)
• Hugh Bigod, 1st Earl of Norfolk (b. 1095)

• England — Henry II (reigned 1154–1189)
• France — Louis VII (reigned 1137–1180)
• Byzantine Empire — Manuel I Comnenus (reigned 1143–1180)
• Pope — Alexander III (pope 1159–1181)
• Song China – Song Xiaozong (宋孝宗) (reigned 1162–1189)