Month names collection / metastudy

[eggyk]

In some genuinely breaking news, I have found our first ever example of an 'o' AND 'L' in a july variant: Joilet. I came across the following two second hand sources for the same correspondance:
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Both are referring to "BnF Département des manuscrits, Lorraine 184, fol. 4", a letter from 1259 that is unfortunately not digitised. I thought it was a 19th century typo...

...but it isn't. I sent a question to the BnF, explaining the situation and why it's relevant, and asked for potential ways to validate the variant. I can't believe it, but they simply replied to me with an unprompted jpeg image of a part of the actual letter (presumably literally taken ~10 minutes before the email was sent based on the filename). 

Here is the important section: mois de Joilet
   

Genuinely huge thanks and shoutout to BnF and the librarians at SINDBAD for the help. 

(there must be one in there, right?)

That is what I thought a good many hours of searching ago...  But I hope it's hiding there somewhere!