On This Day

What Happened in October 1582

Historical Events


Gregory Conquers Julius CaesarGregory Conquers Julius Caesar

Oct 4 Last Julian calendar day in Spain, Portugal and pontifical states. To sync to the Gregorian calendar, 10 days are skipped and the next date is Oct 15.
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Pope Gregory XIII with the calendar that was to make his name
Pope Gregory XIII with the calendar that was to make his name
  • Oct 15 Gregorian calendar introduced in Spain, Portugal and pontifical states, after skipping 10 days after Oct 4 to sync the calendar

Famous Birthdays

  • Oct 17 Johann Gerhard, German Lutheran leader (d. 1637)
  • Oct 19 Dmitry Ivanovich [Dmitry of Uglich], Russian Tsarevich and son of Ivan IV "the Terrible" (d. 1591)
  • Oct 21 Johan Ernst earl of Nassau-Siegen, military/son of Johan VII

Famous Deaths

  • Oct 4 Theresia van Avila, Spanish mystic writer, dies