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Inter gravissimas
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Inter gravissimas, the 1582 papal bull of Pope Gregory XIII, is the Catholic Church's own primary legal instrument promulgating the Gregorian calendar reform. As the Church's own act of institution, it is fully authoritative for what the reform actually did and for the bull's own stated reasoning, which repeats the traditional claim, traceable to Dionysius Exiguus, that the Council of Nicaea had established the rules for calculating Easter. It is the primary instrument itself, not an independent historical account of the calendar reform's background or reception, which needs a separate scholarly source.
Facts
Assessment
Reliability Tier1
Reliability tier 1: the Church's own founding legal instrument, fully authoritative for what the reform did and for the bull's own stated reasoning. NotesThe 1582 bull promulgating the Gregorian calendar reform. Repeats the claim, traceable to Dionysius Exiguus, that Nicaea established the rules for Easter.
Citation
AuthorPope Gregory XIII
Publication Year1582
This entry's own notes already name it: "The 1582 bull promulgating the Gregorian calendar reform." The PublicationYear field itself had simply not been set to match. Source Typeprimary-text
Custodian
Custodian SourceYes
Custodian BodyPope Gregory XIII
Custodian BasisThe papal bull promulgating the Gregorian calendar. Authoritative as the Church own act of reform, which is the fact cited.
Cross-Tradition Connections
Associated With
This source names Gregory XIII directly: "gravissimas, the 1582 papal bull of Pope Gregory XIII, is the Catholic Church's own primary legal instrument promulgating the Gregorian calendar reform."
Nicaea, Cities This source names Nicaea directly: "Dionysius Exiguus, that the Council of Nicaea had established the rules for calculating Easter."
Claims Backed By This Source (13 claims)
This source backs 13 claims across the atlas. As facts: 9 well-attested. As cited relationships: 2 holds. Plus 2 entities citing it as a general reference with no single fact or relationship attached.
Disposition By Topic
- Sources, 11 claims: 9 well-attested, 2 holds.
- Holidays & Festivals, 2 claims: 2 general references.
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