Alright, before I go onto my theory, I'll say this: if this post contains idiocy, that's not on purpose. I'm serious about this, and if you have evidence that says it's impossible, good for you, and for me, I suppose. Post a comment about it or something. Anyway, here goes:
I was just looking at the amazing pages of the perpetual mystery book, the Voynich manuscript, when I had a sort of thought. What if the strange phrase in Dante Alighieri's "Inferno" is a quote from the Voynich manuscript? It sure looks like the kind of thing that has the same amounts of letters and stuff as what a lot of the pages of the Voynich Manuscript have. "Raphèl maí amèche zabí almi", really appears to be a Voynichy thing, doesn't it? Alright, so, that thought went further; Dante was from northern Italy. The Voynich manuscript is thought to be from northern Italy. The odds are still against it, but if you've read the Divine Comedy, you'll know that there are some rather weird things in it. The Voynich manuscript has weird things in it; the hermaphrodites and all kinds of plants and so on. The astronomical things, which I think Dante also seemed to be fond of, unless I'm remembering wrong. And so is the general "atmosphere" of both works in a strange, unexplainable way, at least to me.
So the theory is that Dante Alighieri wrote the Voynich manuscript. Now, don't say that it was written about a century after his death. That may be true for the copy that remains; the whole book's history is shrouded in mystery just as much as its contents so who could make a definitive claim that it's the only copy? What if it's just a transcript of an older one? That could explain the smudginess that's on some pages, and the other things that seem to be errors.
If this is true, when did he write it? I'd say that it was before the Divine Comedy, but not by much; maybe when he was exiled. Maybe he was depressed and felt the need to write even if it turned out "nonsensical" in a way, and thus the Voynich manuscript came into existence. I mean, the pictures aren't very good (which could be attributed to that it might not be the original one, but also that they were done in a state of ill mental health) and Dante didn't, as far as I know, do any visual art, which could explain why they look like that, especially if he was depressed when doing it. I'm not saying that it's just all gibberishy nonsense, of course. Maybe it's actually a combination of languages, just like those mysterious phrases in "Inferno" seem like, but written in a new alphabet just for the purpose of the book. Whatever languages he knew (I don't know, and I don't know if anyone else knows for sure either), he might have taken certain words from one language and others from another, "randomly" however he felt like it, and it didn't end up being poetry or any other "coherent" form of writing, and just some sort of diagrams, descriptions and whatnot, maybe unconscious plans that would later be used for the Comedy in different ways.
Maybe the original copy was burned or lost, but still exists somewhere. That would certainly be worth finding, if it turned out to be true, but I'm pretty sure it's not, since all books that are mysterious enough were probably considered threatening by the church in the middle ages and burned or buried somewhere or something like that.
If you're anyone who can get this theory out to the world, please link this post to any important science people and stuff. And if it's been thought of before, sorry, I tried to google but couldn't find anything that would indicate anyone has considered the possiblity that it was Dante who wrote it.
EDIT: Ok, so it turns out everyone has thought of it before. Oh well.