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1 Testone - Gregory XIII Religion
| Issuer | Papal States |
|---|---|
| Year | 1572-1585 |
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| Composition | Silver (.917) |
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|---|---|
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| Obverse lettering | GREGORIVS · XIII · PON · M · A · X · (Translation: Gregory 13th Supreme Pontiff Year 10) |
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| Mintage | ND (1572-1585) - - ND (1572-1585) - Bust of Gregory XIII facing right - 1581 - A. X - 1582 - A. XI - 1584 - A. XIII - |
| Additional information |
Gregory XIII is best remembered for the 1582 calendar reform that replaced the Julian system with the Gregorian — a correction of roughly eleven minutes per year that had accumulated into a ten-day drift since the Council of Nicaea. The reform required a papal bull, Inter gravissimas, and the immediate suppression of ten calendar days in October of that year. Protestant nations refused adoption for over a century, treating it as a Roman provocation rather than an astronomical necessity.
Testonе coinage of this pontificate was struck at Rome under the direction of the papal mint on the Capitoline Hill.