Also on the other Voynich Wiki [1]
Peter Jan Beckx (also Pieter Jan Beckx, in French Pierre Jean Beckx, (8 February 1795, Zichem, present day Belgium – 4 March 1887, Rome, Italy) was a Belgian Jesuit, elected 22nd Superior-General of the Society of Jesus, and was active in the latter role.
In 1870, with the creation of the Italian state, the secular government expressed an intent of nationalising religious properties and the objects therein, he was responsible for saving for the order many books and manuscripts, partly by claiming them as private collections. This was to include what was later known as the Voynich Manuscript (which contains his ex libris): the collection was then transferred to the Villa Mondragone.
His biography on Wikipedia is at [2].