"I had thought of Frater when I first saw it, but I became less sure! Perhaps it is plausible. Can Berthelot be a first name, in that case? I think it is mainly a family name in modern French, is it not? Dominique Gatté said:
Merci à vous !
Pour le…"

"On the signature: I am still working on the first word (presumably a first name), but I would like to suggest '... berthelot augustinus de ambianis' (i.e. from Amiens)."

"I have tried to think of other possible words that this might be, but it's difficult to find any that work. On 'vi' = strength, see my first post here, which has already mentioned this.

RW"

"Thanks, Olivier. I had wondered myself about both of your questions! In my experience, if the scribe had made a mistake with the letter following the 'i' at the time of the original writing, he would normally have erased the mistake and then…"

"A random observation from a palaeographical rather than organological perspective: it is clearly an erasure between the 'i' and the 'e', so it seems likely that this erasure was done for a joke at some point (perhaps much later), to form…"