What happened on September 17

71 documented historical events happened on September 17, from antiquity to the present day. The best known is this: Byzantine–Seljuk wars: At the Battle of Myriokephalon in Phrygia, the Seljuq Turks prevented Byzantine forces from taking the interior of Anatolia. On the same day, in another year: Following Louis I's death without a male heir, his daughter Mary was crowned with the title of "King" of Hungary. 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 September 17, including Robert B. Parker, Chuck Grassley, Maureen Connolly. 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.

117 people with a Wikipedia article died on September 17, including Hugh of France (son of Robert II), Conan III of Brittany, Hildegard of Bingen. 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.

17 observances are celebrated on September 17 around the world: Australian Citizenship Day, Christian feast day: Albert of Vercelli, Christian feast day: Ariadne of Phrygia, Christian feast day: Blessed Cecilia Eusepi, Christian feast day: Stanislaus Papczyński, Christian feast day: Hildegard of Bingen. 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.