An oddity of the Gregorian calendar is the omission of the year 0, as this was not considered to be a valid number in the sixteenth century.
Lilius's brother Antonius was granted the privilege for producing these calendars, but he could not cope with the demand so the privilege was revoked in September 1582. From the surviving copies it can be seen that production was farmed out to various printers in Rome and Venice, and in 1583 production moved further abroad.
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