Who introduced the Gregorian calendar?

Pope Gregory I, called the Great
St. Gregory the Illuminator
Pope Gregory XIII
Galileo
Gregory XIII was pope during the period from 13 May 1572 until 10 April 1585. The Gregorian calendar, also called the Western Calendar, was introduced by him in 1582 with the Bull Inter Gravissimas. The Gregorian calendar basically a refinement of the Julian calendar. The Gregorian reform modified the Julian calendar's scheme of leap years, changing the mean length of the calendar year from 365.25 days to 365.2425 days.
Krzysztof Moskal
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Very interesting!
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Pope Gregory I, called the Great
St. Gregory the Illuminator
Pope Gregory XIII
Galileo
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flagRepublic of Ireland
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70%
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flagSwitzerland
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10%
70%
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flagthe Netherlands
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70%
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flagGreece
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65%
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flagPoland
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63%
8%
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flagGermany
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flagthe United Kingdom
25%
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53%
10%
131
flagAustria
32%
8%
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34
flagItaly
33%
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12
flagthe United States
25%
11%
40%
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137
flagIndia
24%
21%
40%
13%
65
flagAustralia
34%
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39%
8%
23
flagFrance
60%
13%
20%
6%
15