August 13 is the 225th day of the year (226th in leap years) in the Gregorian calendar. There are 140 days remaining until the end of the year.
Events：
29 BC – Octavian holds the first of three consecutive triumphs in Rome to celebrate the victory over the Dalmatian tribes.
523 – John I becomes the new Pope after the death of Pope Hormisdas.
554 – Emperor Justinian I rewards Liberius for his long and distinguished service in the Pragmatic Sanction, granting him extensive estates in Italy.
582 – Maurice becomes Emperor of the Eastern Roman Empire.
900 – Count Reginar I of Hainault rises against Zwentibold of Lotharingia and slays him near present-day Susteren.
1099 – Pope Paschal II succeeds Pope Urban II as the 160th pope.
1516 – The Treaty of Noyon between France and Spain is signed. Francis I of France recognizes Charles's claim toNaples, and Charles V, Holy Roman Emperor, recognizes Francis's claim to Milan.
1521 – After an extended siege, forces led by Spanish conquistador Hernán Cortés capture Tlatoani Cuauhtémoc and conquer the Aztec capital of Tenochtitlan.
1532 – Union of Brittany and France: The Duchy of Brittany is absorbed into the Kingdom of France.
1536 – Buddhist monks from Kyoto, Japan's Enryaku-ji temple set fire to 21 Nichiren temples throughout in what will be known as the Tenbun Hokke Disturbance. (Traditional Japanese date: July 27, 1536).
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