1171 ( MCLXXI ) was a common year starting on Friday of the Julian calendar , the 1171st year of the Common Era (CE) and Anno Domini (AD) designations, the 171st year of the 2nd millennium , the 71st year of the 12th century , and the 2nd year of the 1170s decade. As of the start of 1171, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.

Events [ change | change source ]

• Saladin bans the Fatimid Caliphate , bringing back Sunni rule in Egypt .
• Manuel I Comnenus orders all the Venetians in the Byzantine Empire to be arrested.
• Rhys ap Gruffydd agrees to talk to Henry II of England .
• Building of the Cathedral of Saint Sabino in Bari is finished.
• Serbian ruler Stefan Nemanja begins to rule alone.
• Alfonso II of Aragon beats Caspe and Teruel .
• Henry II of England starts eight centuries of conflict and war between Ireland and England .
• Pisa and Florence make an alliance against Lucca and Genoa .
• The Heirs of Robert Burdet leave Catalonia .

Births [ change | change source ]

• August 15 ? King Alfonso IX of Leon (d. 1230 )
• Agnes of France , daughter of Louis VII of France (d. after 1207 )

Deaths [ change | change source ]

• January 1 ? Diarmait Mac Murchada , King of Leinster (b. 1110 )
• February 20 ? Conan IV, Duke of Brittany (b. 1138 )
• November 8 ? Baldwin IV, Count of Hainaut (b. 1108 )
• Henry of Blois , bishop of Winchester (b. 1111 )
• Gleb of Kiev