Wilfrid Voynich and William Romaine Newbold were of the opinion that Roger Bacon was the author of the Voynich Manuscript, based in part upon the associated material that so assigned it. There was also Bacon's reputation - he was known by the scholastic accolade Doctor Mirabilis (Latin for "miracle doctor").
As Roger Bacon lived considerably before the time the VM has been dated to, he was not its author directly. There is also no evidence of a linking tradition or influences - texts, script or likely chain of contacts between Bacon (based in England and Paris) and the author(s) of the manuscript (who seem to have been based in Italy).
The Cipher Mysteries page on the subject is .