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The Tiara of Pope Gregory XIII is the oldest surviving papal tiara in existence. Its actual date of manufacture is not recorded. It is known however that it was manufactured during the reign of Pope Gregory XIII (1572-1585), the creator the Gregorian calendar.
Until 1798 many ancient tiaras existed in the Vatican. However invading French troops stole and smashed all the tiaras they could get their hands on, stealing their jewels, which they transported back to Paris. It is unknown how the Gregory XIII's tiara survived the destruction.
Though the oldest papal tiara, there are no modern recorded cases of it being worn by popes, many of whom used the 1834 tiara of Pope Gregory XVI, the Palatine Tiara or a tiara donated to them on their election.