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Events on October 15 in history

Pope Gregory XIII
1582Oct, 15

Pope Gregory XIII implements the Gregorian calendar. In Italy, Poland, Portugal, and Spain, October 4 of this year is followed directly by October 15.

Pope Gregory XIII (Latin: Gregorius XIII; Italian: Gregorio XIII; 7 January 1502 – 10 April 1585), born Ugo Boncompagni, was head of the Catholic Church and ruler of the Papal States from May 13th, 1572 to his death in 1585. He is best known for commissioning and being the namesake for the Gregorian calendar, which remains the internationally accepted civil calendar to this day.

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Events on 1582

  • 24Feb

    Gregorian calendar

    With the papal bull Inter gravissimas, Pope Gregory XIII announces the Gregorian calendar.
  • 16Apr

    Hernando de Lerma

    Spanish conquistador Hernando de Lerma founds the settlement of Salta, Argentina.
  • 21Jun

    Honnō-ji Incident

    Sengoku period: Oda Nobunaga, the most powerful of the Japanese daimyōs, was forced to commit suicide by his own general Akechi Mitsuhide.
  • 28Nov

    William Shakespeare

    In Stratford-upon-Avon, William Shakespeare and Anne Hathaway pay a £40 bond for their marriage licence.