1173

Events

• Canonization of Saint Thomas à Becket, buried at Canterbury
• August 9th - Construction starts on the Leaning tower of Pisa
• Castle at Abergavenny was seized by the Welsh.
• Conversion to Christianity of Peter Waldo and the subsequent founding of the Waldensians.
• End of Qiandao era and start of Chunxi era of the Chinese emperor Xiaozong
• End of reign of Polish ruler Boleslaus IV of Poland and start of reign of Casimir II of Poland
• Eleanor of Aquitaine and her sons rebell against her husband Henry II of England in the Revolt of 1173-1174
• First recorded use of Algebraic chess notation

Births

• Welsh prince Llywelyn the Great
• Conrad II, Duke of Swabia
• Shinran, founder of Jodo Shinshu Buddhism

Deaths

• Richard of St. Victor
• Belarussian nun Euphrosyne of Polatsk, major contributor to Medieval Belarussian Culture.
• Boleslaus IV, High-Duke of Poland
• Vladimir II Mstislavich, Grand Prince of Kiev