1582 October 5th to October 14th did not exist ever. Before October 1582, Julian calendar was used extensively. In October 1582, a change was made from the old Julian calendar to the new Gregorian calendar. To align the change in seasons between these 2 calendars, Pope Gregory XIII deleted 10 days from the year 1582. On 29 September 1582, Philip II of Spain passed the change from the Julian to the Gregorian calendar.
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