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There is no such thing as THE Gregorian Sacramentary. The term "Gregorian" refers to a large family of related manuscripts ultimately deriving from a common source, but varying widely in details, provenance, period of production, etc., etc. The manuscript discussed here isn't even the most important manuscript in the family. I'm adding this comment here to save anybody who stumbles across this nonsense from thinking the title has anything to do with the topic being discussed. If I have time, I'll come back later and try turn this into a useful article. MonteGargano (talk) 07:24, 6 November 2022 (UTC)[reply]