1173
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| Millennium: | 2nd millennium |
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| Centuries: | 11th century – 12th century – 13th century |
| Decades: | 1140s 1150s 1160s – 1170s – 1180s 1190s 1200s |
| Years: | 1170 1171 1172 – 1173 – 1174 1175 1176 |
| 1173 by topic |
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1173 Media
Mieszko III, Duke of Greater Poland 1173–1202
1173 (MCLXXIII) was a common year starting on Monday of the Julian calendar, the 1173rd year of the Common Era (CE) and Anno Domini (AD) designations, the 173rd year of the 2nd millennium, the 73rd year of the 12th century, and the 4th year of the 1170s decade. As of the start of 1173, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.
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