1173

1173 was a common year.

Millennium:	2nd millennium
Centuries:	11th century – 12th century – 13th century
Decades:	1140s  1150s  1160s  – 1170s –  1180s  1190s  1200s
Years:	1170 1171 1172 – 1173 – 1174 1175 1176

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 rebel against her husband Henry II of England in the Revolt of 1173-1174
• First recorded use of algebraic chess notation