Jan Gryll z Gryllowa

[aStobbart]

The writing on the cover seems to be a case where 'old vellum'  was reused to make the cover, i.e. the writing was there before.

Yes, the physical description on manuscriptorium also suggests this:

Vazba pergamenová, na lepenkových deskách nalepen druhotně použitý list s rukopisným textem.

There seem to be two Jan Gryll's, and I guess they are father and son. The one that was in contact with Rudolf seems to have been the father.

His name does not appear in the very long list of people who have been recorded here:
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The firt page feature the full name of the author, and I read the second name as "Starssi" (with two long S)

Interesting coincidence: the book by Josef Jungmann was one of the sources used by Voynich's staff (Herbert Garland) to find out who could be the mysterious  "Jacobus de Tepenec"  who put his Ex Libris in the Voynich MS (in which Garland was successful). I wonder if he used a translation.

I found at least another edition of Jungman's historia on google books, in german.
I made a transcription of Horčický's entry, for anyone interested. The book by Jungman also has a short entry on Marci's friend, Jakub Dobrensky.
From the entry on Horčický, we know his exact date of death and the fact that he left a large sum of money to the jesuits. This of course is common knowledge at this time.

Horčický, z Tepenece, Jakub (jinak též Synapius). Učil se u Jesuit w Krumlowé; přijat do semináře jejich w Praze. Pro swéchemické umění zalibil se Rudolfowi II., od něhož do stawu urozeného powýšen (1608) a obohacen byl. Jesuitům, jimž základ štěstí swéhoděkowal, odwděčil se podporowáním žádosti jejich u dwora. Po smrti Rudolfa odstěhowal se na swé nabyté statky, hydlíwaje obyčejně na Mělníce, jenž mu byl we weliké summě zastawen. Umřel r. 1622 25. Září w Praze, kamž se byl w nemoci swé přestěhowal, jmění swé odkázaw Jesuitům.