Month names collection / metastudy

[Mauro]

An interesting example You are not allowed to view links. Register or Login to view. of an author writing a section in Italian(?):

martio, aprili, magio, iunio, julio, augustus, septembri, octobri, nouembri, decembri

However, after december the author switches seemlessly to what seems to be low saxon, in the exact same hand, same ink, same everything. We see 'meye' and 'owest' straight away, with the typical "looks both german and dutch" vibe of low saxon languages. 

But a You are not allowed to view links. Register or Login to view. on in a different hand(?), there is: 
".... blut late in deme achten dage des aprilis - efte des ersten in decembri - dester uet binnen vertich dagen - we des seuendes efte des achten dages des apriles blot let de wirt blint - we up den lesten dach in martio - esfe des viften dages..... "

The manuscript is dated to the 14th century. Does anyone have an idea how this combo of language could have happened?

It's surely not Italian as intended today (marzo, aprile, maggio, giugno, luglio, agosto, settembre, ottobre, novembre, dicembre), nor any local italian language I know of, but surely it looks to be on the path from vulgar Latin to Italian. The consonants at the end of Latin declensions have been lost (except in augustus), which is exactly what happened for Italian. 'martio' is very close to marzo (in school it would be read marzio, ti = zi), nouembri = novembri I guess, and the other differences are phonetically miminal I think, the most puzzling being final-i instead of final-e.

Whatever language(s) it was, it's a remarkable example of language-mixing in month names. Not exactly as the VMS (where the switches happens inside the same unit of text) but interesting nonetheless.