Other members (
not Koen) please note: Having far less time for the forum than I once did, comments about my own comments are unlikely to be seen by me.
Koen,
I'm not sure if you're talking about
the ascenders as such or dating the content by
similar ornament, so I'll address both issues as I covered them in 2015. For this subject, the most relevant of my posts s probably 'Who wrote the Gallows' , voynichimagery.com (7th October 2015).
It attracted a wide readership and made some useful new points (to judge from their subsequent dissemination).
Jim Reeds' first noticed ascenders in connection with 'gallows' and meticulously acknowledged his source (of course). See first mailing list rather than secondary reports.
I took his brief excursus and researched it in more depth. It was soon clear that the 'elongated ascender' as such is to be associated primarily with religio- legal documents as e.g. establishment documents for religious orders; land-grants for religious orders, and for universities and other items having legal force as well as (e.g.) books about the rules of law or 'laws' of grammar. Highly educated religious scribes were most likely to have been assigned duty in writing out documents of such a sort. ( "Law and scribe" proved a fascinating ancillary research topic, by the way)
A majority of examples sighted for the 'elongated ascenders' came from Papal representatives scribes and scriptoria.
Just to be clear, I coined that description 'elongated ascenders' for convenience and it seems to be due to Helmut that we owe the somewhat later-appearing Latinised version of that term. Unless I accidentally re-invented some term from formal palaeography of which I can find no other sign. So it was kind of Helmut to make the term I invented sound so much more authoritative by turning it into Latin.
Anyway - back to the subject: the Holy Roman E's secular scriptorium for a time employed a version of that style, but it tended tended become overly ornate, and far too ornate to provide any reasonable comparison for the Vms' - so as far as I was able to find.
The range which has to be considered runs from the 7thC (When researching Guglio Libri, I cited the Luxueil script) and must include 10thC Spain (for which I acknowledged as my chief source the original research and thesis by Johnathan Jarrett - who kindly gave permission for me to use certain pictures as illustration.
Aside: I was severely embarrassed to notice that not only was my own work 'filched' and reused without attribution, but so was Johnathan's. I understand that many people in the wider world of social media cannot distinguish between the results of original research and the anonymous matter in wiki articles, but surely members here will have better standards.
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Ornament:
Two important points here: first that pen-work is not 'doodling' and secondly that the the larger proportion of works employing the technique are NON-Latin texts.
The period for the Latin examples is chiefly from the 12th- and 13thC, and the important basis for comparison is the ornamental 'palette' in the Voynich map.
I did not publish this on any wordpress blog before; I've had to do it now only to be able to post it here. From a 13thC grammar. I regret that past experience leads me to omit details of its provenance or location.