Trinity College Cambridge - B.11.31

Not much is included about this book in the online catalogue, or even the usually-reliable James catalogue.  The total information provided boils down to "French, 15th C".  Even though the coat of arms on the cover is recognized as that of Anne of Austria, Queen of Louis XIII, that's too late of a date to help localize the manuscript

The calendar is most unusualm and error-filled.  It is essentially a Parisian "complete" calendar, with one name per day, except May 12 which the scribe skipped.  The color pattern is unusual, two reds and 2 blues rather than the usual alternation.  An example of the oddities is seen on the second half of September where Cosmos and Damian, the paired doctor saints are seperated, with Damian being demoted to the 28th. 

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