Dr. Hartlieb's alleged involvement in the creation of the Voynich Manuscript

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As a prolific writer, Dr. Hartlieb would certainly have possessed a substantial stock of old parchment — produced during the first half of the 15th century — which he could have handed over to a team of scribes to produce the manuscript based on his own drafts and instructions.

And what is the reason this well off royal court doctor chose for this job some old and quite poor quality parchment with holes and other defects? Many defects and holes certainly predate writing, since the writing goes around them.