1173
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Events

• Saint Thomas Becket is buried at Canterbury and canonized.
• Abergavenny Castle is seized by the Welsh.
• Peter Waldo is 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 is first recorded.
• The Leaning Tower of Pisa is built.
• Saladin seizes Aden in Arabia.

Births

• Llywelyn the Great, Prince of Aberffraw and Lord of Eryri (approximate date; d. 1240)
• Rostislav II of Kiev (d. 1214)
• Shinran, Japanese founder of Jodo Shinshu Buddhism (d. 1263)
• Conrad II, Duke of Swabia (d. 1196)
• Tankei, Japanese sculptor (d. 1256)

Deaths

• August 9 — Najm ad-Din Ayyub, father of Saladin
• Roger de Clare, 3rd Earl of Hertford (b. 1116)
• Vladimir II Mstislavich, Grand Prince of Kiev (b. 1132)
• Boleslaus IV, High-Duke of Poland (b. 1120)
• Richard of St. Victor, French mystic and theologian
• Benoît de Sainte-Maure, French poet and troubadour (b. 1154)