The 2012 celebration of the 100th anniversary of the 'discovery' of the Voynich MS by Wilfrid Voynich took place in Villa Mondragone, on 11 May.
At the time of the event, I already had some doubt about both the year and the location of this discovery.
By now, it is clear that he did not discover the set of manuscripts including the Voynich MS, but he certainly bought it sometime somewhere.
For the year, it really seems that 1912 is right, even though the deal may have been started in 1911. It even seems that the deal may have been concluded in May, but we may never find out for certain. There is a 'Terminus Ante Quem' for 26 June, when two of the manuscripts from this sale were seen in Budapest.
For the place of the sale, I have no more news (yet).
One of the hotels that was recommended to visitors of the Villa Mondragone event was Villa Vecchia, at the foot of the hill on which Mondragone lies (You are not allowed to view links.
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Login to view.). I don't remember who among the attendants stayed there. I was in the centre of Frascati. We didn't know then, but this Villa also has a very minor role in the history of the MS.
The main set of documents that the Jesuits wanted to salvage from confiscation in 1873, and which were marked as 'from the private library of P. Beckx' were taken from Rome to a Villa in Castel Gandolfo called the Villa Torlonia, which was also hosting the Jesuit novitiate (moved there from Rome). This set of documents included the well-known volumes of the Kircher correspondence.
It stayed there until 1919, when the the prince of Torlonia decided to cancel the rent of the place to the Jesuits. The collection of manuscripts was taken back to Rome, while the novitiate moved to the above-mentioned Villa Vecchia in the town of Monteporzio Catone. This villa was turned into a hotel much later.