Wikipedia:Selected anniversaries/August 20

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 * 636 – Rashidun forces led by Khalid ibn al-Walid took control of Syria and Palestine in the Battle of the Yarmuk, marking the first great wave of Muslim conquests.
 * 917 – Byzantine–Bulgarian wars: Bulgarian forces led by Tsar Simeon I drove the Byzantines out of Thrace with a decisive victory at the Battle of Achelous.
 * 1710 – War of the Spanish Succession: A Spanish Bourbon army commanded by the Marquis de Bay was soundly defeated by a multinational army led by the Austrian commander Guido Starhemberg.
 * 1794 – American troops defeated the Northwestern Confederacy, a Native American alliance, at the Battle of Fallen Timbers, the decisive battle of the Northwest Indian War.
 * 1909 – Pluto was photographed for the first time at the Yerkes Observatory in Williams Bay, Wisconsin, U.S., 21 years before it was officially discovered by Clyde Tombaugh.
 * 1950 – Korean War: United Nations forces repelled an attempt by North Korea to capture the city of Taegu.
 * 1988 – The Troubles: The Provisional Irish Republican Army bombed a bus carrying British Army soldiers in Northern Ireland, killing eight of them and wounding another twenty-eight.
 * 1988 – Fires in the United States' Yellowstone National Park ravaged more than 150000 acre, the single-worst day of the conflagration.
 * 1989 – The final stage of the O-Bahn Busway in Adelaide, South Australia, was completed, at the time the world's longest and fastest guided busway with buses travelling a total of 12 km at maximum speeds of up to 100 km/h.
 * 1989 – After colliding with the dredger MV Bowbelle (1964) on the River Thames in London, the pleasure boatMarchioness sank in just thirty seconds, killing 51 people.
 * Born/died: | Henry Every |b|1659| George Tucker |b|1775| James Prinsep |b|1799| Bolesław Prus |b|1847 | Rudolf Bultmann |b|1884|H. P. Lovecraft |b|1890| Terry Sanford |b|1917| Ron Paul |b|1935|Agnes Giberne |d|1939| Amy Adams |b|1974| Jack King |b|1985| Mika Yamamoto |d|2012| B. K. S. Iyengar |d|2014| Kelsey Weems |d|2019