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1172 ( ) was a MCLXXII leap year starting on Saturday (link will display the full calendar) of the Julian calendar.
April- May – Béla returns to Hungary, where he is acclaimed king. Richard Lionheart becomes
Duke of Aquitaine (later King Richard I of England).
Henry II of England and Humbert III, Count of Savoy agree to wed their respective heirs, John of England and Alicia. The alliance never occurs because Henry's elder heir, Henry the Young King, becomes jealous over the castles which the elder Henry promises to the couple, and stages a rebellion which will take the elder Henry two years to put down. By that time, Alicia has died. 
Alberto di Morra is sent by Pope Alexander III to the Council of Avranches, where Henry II of England is absolved of the sin of murder, in the matter of the assassination of Thomas Becket. The
Synod of Cashel ends the Celtic Christian system, and brings them under the Pope. A Muslim rebellion is quelled at
Prades; this event marks the end of the pacification of the lands recently conquered by the Catalans.  According to the annals of the
Worcester Priory, "nothing memorable" happens in this year. 
References [ edit ]
^ King John by Warren. Published by the University of California Press in 1961. p. 29
^ McGrank, Lawrence (1981). "Norman crusaders and the Catalan reconquest: Robert Burdet and te principality of Tarragona 1129-55". Journal of Medieval History. 7 (1): 67–82. doi: 10.1016/0304-4181(81)90036-1.
^ 4 ANNALES MONASTICI (Henry Richards Luard ed., 1869) ("MCLXXII. Nihil memoriale.")