What happened on April 15

44 documented historical events happened on April 15, from antiquity to the present day. The best known is this: The final session of the Lateran Council, convened to rectify abuses in the papal electoral process that had led to the elevation of the antipopes Constantine II and Philip, was held in Rome. On the same day, in another year: Byzantine–Norman wars: After a siege of almost three years, Italo-Norman forces conquered the city of Bari, the capital of the Catepanate of Italy, ending more than five centuries of Byzantine presence in the region. 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 April 15, including Robert Mills (physicist), Georges Descrières, Vigdís Finnbogadóttir. 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.

113 people with a Wikipedia article died on April 15, including Empress Suiko, Richard Poore, Manuel Chrysoloras. 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.

14 observances are celebrated on April 15 around the world: Christian feast day: Abbo II of Metz, Christian feast day: Blessed César de Bus, Christian feast day: Father Damien (Catholic and Episcopal Church), Christian feast day: Hunna, Christian feast day: Paternus of Avranches, Christian feast day: April 15 (Eastern Orthodox liturgics). 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.