blog.Voynichology.net post 3, page 25
What follows are some pertinent questions
& a few preliminary plausible scenarios,
taking into consideration the conjectures
that Voynichese is a Manichaean script designed to write Old Kaladj
& that this Manichaean book travelled to Europe
with travelling Manichaean missionaries before the Inquisition,
when the Manichaean Bogomils in the area around Bosnia
& the Cathars in S.France, Germany & N.Italy,etc., were still active.
Why did the Manichaeans invent a new script for Old Turkic?
Strangely, Old Turkic, or at least
the South-eastern variety, Old Uygur,
may have had more scripts developed or adapted to represent it
than any other language of its time or before.
Old Turkic/Uygur practically
made a practice of collecting scripts.
From approximately 500bce? to 1000ce?,
the various forms of Old Turkic were written in Runes
more or less identical to Nordic Runes,
except that the letter/sound attributions are completely different.
When the Turkic peoples started to really expand,
being central to everybody,
they made contact with very disparate cultures in every direction.