What happened on October 21

61 documented historical events happened on October 21, from antiquity to the present day. The best known is this: First Crusade: At the Battle of Civetot, the Seljuk forces of Kilij Arslan destroyed the army of the People's Crusade as it marched toward Nicaea. On the same day, in another year: Hundred Years' War: The English victory at the Battle of Auberoche marked a change in the military balance of power in Aquitaine, with the subsequent collapse of the French position. On Almanaccolo every event is listed in chronological order, grouped by century, and links to the Wikipedia article it comes from, so you can always read further or check the source. Alongside the events you find who was born and who died on this date, and which observances are celebrated around the world.

160 people with a Wikipedia article were born on October 21, including Steve Cropper, Elvin Bishop, Allan Grice. The list spans every era and every field — art, science, politics, sport, entertainment — ordered by year of birth, from the earliest to the most recent. The six featured people are those most has been written about: the ordering uses the length of their Wikipedia article as an indicator of prominence. For each one you find their occupation, year of birth and a link to the full biography.

108 people with a Wikipedia article died on October 21, including Zhenzhu Khan, Walter Sans Avoir, Robert de Beaumont, 4th Earl of Leicester. The list is in chronological order by year of death and spans all of documented history, from antiquity to the present day. For each person you find their occupation, the year and a link to the Wikipedia biography, where the full story and its sources can be read.

22 observances are celebrated on October 21 around the world: Armed Forces Day (Honduras), Christian feast day: Céline of Laon, Christian feast day: Blessed Charles of Austria (Roman Catholic Church), Christian feast day: Fintán of Taghmon, Christian feast day: Hilarion, Christian feast day: John of Bridlington. The list gathers national holidays, international days and religious or civil observances falling on this date in different countries, as recorded on Wikipedia. Some are fixed and recur on the same day every year; others depend on the local calendar. Each links to the article explaining its origin and meaning.