| 91471 | August 12 | Death | 2014 – Lauren Bacall, American model, actress and singer (b. 1924) |
| 91472 | August 12 | Death | 2014 – Futatsuryū Jun'ichi, Japanese sumo wrestler (b. 1950) |
| 91473 | August 12 | Death | 2014 – Abel Laudonio, Argentinian boxer and actor (b. 1938) |
| 91474 | August 12 | Death | 2014 – Arlene Martel, American actress and singer (b. 1936) |
| 91475 | August 12 | Death | 2014 – Kongō Masahiro, Japanese sumo wrestler (b. 1948) |
| 91476 | August 12 | Death | 2015 – Jaakko Hintikka, Finnish philosopher and academic (b. 1929) |
| 91477 | August 12 | Death | 2015 – Stephen Lewis, English actor and screenwriter (b. 1926) |
| 91478 | August 12 | Death | 2015 – Meshulim Feish Lowy, Hungarian-Canadian rabbi and author (b. 1921) |
| 91479 | August 12 | Death | 2015 – John Scott, English organist and conductor (b. 1956) |
| 91480 | August 12 | Holiday and observance | Christian Feast Day:EupliusHerculanus of BresciaJænberhtJane Frances de ChantalPope Innocent XIAugust 12 (Eastern Orthodox liturgics) |
| 91481 | August 12 | Holiday and observance | Glorious Twelfth (United Kingdom) |
| 91482 | August 12 | Holiday and observance | HM the Queen's Birthday and National Mother's Day (Thailand) |
| 91483 | August 12 | Holiday and observance | International Youth Day (United Nations) |
| 91484 | August 12 | Holiday and observance | Russian Air Force Day (Russia) |
| 91485 | August 12 | Holiday and observance | Russian Railway Troops Day (Russia) |
| 91486 | August 12 | Holiday and observance | Sea Org Day (Scientology) |
| 91487 | August 12 | Holiday and observance | World Elephant Day |
| 91488 | August 13 | Event | 29 BC – Octavian holds the first of three consecutive triumphs in Rome to celebrate the victory over the Dalmatian tribes. |
| 91489 | August 13 | Event | 523 – John I becomes the new Pope after the death of Pope Hormisdas. |
| 91490 | August 13 | Event | 554 – Emperor Justinian I rewards Liberius for his long and distinguished service in the Pragmatic Sanction, granting him extensive estates in Italy. |
| 91491 | August 13 | Event | 582 – Maurice becomes Emperor of the Eastern Roman Empire. |
| 91492 | August 13 | Event | 900 – Count Reginar I of Hainault rises against Zwentibold of Lotharingia and slays him near present-day Susteren. |
| 91493 | August 13 | Event | 1099 – Pope Paschal II succeeds Pope Urban II as the 160th pope. |
| 91494 | August 13 | Event | 1516 – The Treaty of Noyon between France and Spain is signed. Francis I of France recognizes Charles's claim to Naples, and Charles V, Holy Roman Emperor, recognizes Francis's claim to Milan. |
| 91495 | August 13 | Event | 1521 – After an extended siege, forces led by Spanish conquistador Hernán Cortés capture Tlatoani Cuauhtémoc and conquer the Aztec capital of Tenochtitlan. |
| 91496 | August 13 | Event | 1532 – Union of Brittany and France: The Duchy of Brittany is absorbed into the Kingdom of France. |
| 91497 | August 13 | Event | 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). |
| 91498 | August 13 | Event | 1553 – Michael Servetus is arrested by John Calvin in Geneva, Switzerland as a heretic. |
| 91499 | August 13 | Event | 1624 – The French king Louis XIII appoints Cardinal Richelieu as prime minister |
| 91500 | August 13 | Event | 1704 – War of the Spanish Succession: Battle of Blenheim – English and Imperial forces are victorious over French and Bavarian troops. |