Tags: Year.
Year 1582 (MDLXXXII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar and a common year starting on Friday (link will display the full calendar) of the Proleptic Gregorian calendar. However this year also saw the beginning of the Gregorian Calendar switch when the Papal bull known as Inter gravissimas introduced the Gregorian calendar adopted by Spain Portugal the Polish–Lithuanian Commonwealth and most of present-day Italy from the start.