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The '''Gregorian calendar''' is the [[calendar ]] in contemporary use.
The modern calendar began its existence in the Christian era, in 526, started by [[Pope]] John I. The chronologist of the Pope, Dionysius Exiguus, worked further on the calendar, especially concerning [[Easter]].
(Source: [http://wilstar.com/holidays/aprilfool.htm])
[[Category:Church History]]
[[Category:Liturgics]]
