Horčický's books

[ReneZ]

I'm genealogist and here I will give my opinion on all this interesting research on book proveniance.

That is fascinating.  I assume Jacobus Horcicky/Sinapius de Tepenec never married.  Do you know of information on his parents or siblings or other relatives?  It is often said that he acquired the Voynich Manuscript in Prague but I wonder if he could have acquired it near where he was born or where he went to school.

Facinating for sure.
But for me, the investigation is not in his childhood... not yet... The facts first.
The fact is here, there was an identical ex-libris (except the number) on both books. And the name writen is Jacobj à Tepenec. The investigation should ever keep in mind this fact.
Further, it seems that Jacobus Sinapius de Tepenec didn't wrote these two ex-libris, so why ? Who wrote them, how, when, and why ?

Fabien.

Jacobus seems not to have been married, but some relatives have been identified, in Moravia, further suggesting that he was not from Cesky Krumlov but from Moravia.

I am curious how confident you (@dvoileGenealogie) are that the Ex Libris on No4 and No19 are not in Jacobus' hand.
Either way, there is no doubt that he owned these books at some point in time.