What Happened in 1153
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- Mar 23 Treaty of Constance: Frederick I Barbarossa agrees not to reestablish Byzantium in Italy and to support Pope Eugene III
- May 24 Malcolm IV becomes King of Scots
- Nov 6 Treaty of Wallingford (Oxfordshire) signed between King Stephen and the Empress Maude (aka Matilda)
- May 24 David I, King of Scots (1124-53), dies at about 68
- Jul 8 Eugene III [Bernardo], Italian Pope (1145-53), dies
- Aug 17 Eustace IV of Boulogne, son of Stephen of England (b. 1130)
- Aug 20 Bernard of Clairvaux, French monk and saint (founded Clairvaux abbey, preached famous sermon advocating for the Second Crusade), dies (b. 1090)
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List of Years