Events Saint Thomas Becket's buried at Canterbury and canonized. Abergavenny Castle's seized by the Welsh. Peter Waldo's converted to Christianity and founds the Waldensians. End of Qiandao era and start of Chunxi era of the Chinese emperor Xiaozong. Casimir II of Poland succeeds Boleslaus IV of Poland on the throne. Eleanor of Aquitaine and her sons rebel against her husband Henry II of England in the Revolt of 1173–1174. Algebraic chess notation's first recorded. The Leaning Tow… (More on 1173)