I spent my day browsing through beautiful manuscript from the British Library - Add MS 12228 here - late 14th century telling the story of Meliadus. Lots of knights battling and traveling - sea, castles, towers, tents and fountains - very VMs nine-rosettish.
What is really Voynichese in this manuscript is the signature on the bottom of the first page, supposedly in 17th century hand, which reminds of the heavily damaged, yet still showing, signature of Jacobus Sinapius (of Tepenec). According to the British Library the signature reads T. de Metz - which with little smudging can be turned into Tepenez. Most likely there is nothing to it. Just the preoccupation with the Voynich Manuscript skewing my perceptions.
You can read in dept research on the Tepenec's signature on Jan Hurych web-site here
UPDATE. Rene Zandbergen reminded me of his award-winning documentary The Voynich Code - The World's Mysterious Manuscript (see here) where the Tepenec's signature is displayed under special illumination. You can see that the name is spelled very similar to signature found in a book from the Tepenec's estate held today in the Clementinum library.
Rene Zandbergen also pointed out that next to Tepenec's signatures usually there is a number present and similar symbol for number and what is probably 9 appear under the signature in the VMs.
In light of all this research the T. de Metz signature seems to be just a coincidence.