Denis the Little Tinkers with the Calendar We celebrate Christmas on December 25 due to the efforts of a Scythian monk known to history as Denis the Little, who tinkered with the calendar by papal request. In the 6th century C.E., a Scythian monk and member of the Roman curia named Dionysius Exiguus (or Denis the Little) decided that the calendar should honor Jesus Christ rather than the founding of Rome and set about calculating the date based on the birth of Christ. The result is the modern calendar. Denis set the date of Jesus' birth at December 25, 1 B.C.E. with the year 1 C.E. following a week later. And so it has been ever since.

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