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Gregory XIII
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Introduction
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Gregory XIII: Media
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How is a pope elected?
Popes are elected for life. Learn about how they get the job.
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Gregory XIII
Pope Gregory XIII, detail from a monument by Pier Paolo Olivieri, 16th century; in...
Alinari/Art Resource, New York
Gregorian calendar
The introduction of the Gregorian calendar, depicted in relief on the tomb of Pope...
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in these related Britannica articles:
Media for: Pius IV
Media for: Paul IV
Media for: Paul III
Media for: Innocent III