Indeed Gregorovius cites the pamphlet as one of the authorities to support Burchard, and to show that what Burchard wrote must have been true; the other authority he cites is Matarazzo, disregarding not only the remarkable discrepancy between Matarazzo's relation and that of Burchard, but the circumstance that the matter of that pamphlet became current throughout Italy, and that it was thus--and only thus--that Matarazzo came to hear of the scandal.( 1) 1 The frequency with which the German historian cites Matarazzo as an authority is oddly inconsistent, considering that when he finds Matarazzo's story of the murder of the Duke of Gandia upsetting the theory which Gregorovius himself prefers, by fastening the guilt upon Giovanni Sforza, he devotes some space to showing--with perfect justice--that Matarazzo is no authority at all.
The Letter to Silvio Savelli opens by congratulating him upon his escape from the hands of the robbers who had stripped him of his possessions, and upon his having found a refuge in Germany at the Emperor's Court.
It proceeds to marvel that thence he should have written letters to the Pope begging for justice and reinstatement, his wonder being at the credulity of Savelli in supposing that the Pope--"betrayer of the human race, who has spent his life in betrayals"-- will ever do any just thing other than through fear or force.

Rather does the writer suggest the adoption of other methods; he urges Savelli to make known to the Emperor and all princes of the Empire the atrocious crimes of that "infamous wild beasts" which have been perpetrated in contempt of God and religion.

He then proceeds to relate these crimes.

Alexander, Cesare, and Lucrezia, among others of the Borgia family, bear their share of the formidable accusations.

Of the Pope are related perfidies, simonies, and ravishments; against Lucrezia are urged the matter of her incest, the supper of the fifty courtesans, and the scene of the stallions; against Cesare there are the death of Biselli, the murder of Pedro Caldes, the ruin of the Romagna, whence he has driven out the legitimate lords, and the universal fear in which he is held.
It is, indeed, a compendium of all the stories which from Milan, Naples, and Venice--the three States where the Borgias for obvious reasons are best hated--have been disseminated by their enemies, and a more violent work of rage and political malice was never uttered.