In his Lucrezia Borgia he almost improves upon it when he says that "The Venetian ambassador, Paolo Capello, reports how Cesare Borgia stabbed the chamberlain Perotto, etc., but Burchard makes no mention of the fact." Of the fact of the stabbing, Burchard certainly makes no mention; but he does mention that the man was accidentally drowned, as has been considered.

It is again--and more flagrantly than ever--a case of proving Cesare guilty of a crime of which there is no conclusive evidence by charging him with another, which--in this instance--there is actually evidence that he did not commit.
But this is by the way.
Burchard's entries in his diary relating to the assault upon Alfonso of Aragon can no more escape the criticism of the thoughtful than can Capello's relation.

His forty horsemen, for instance, need explaining.
Apart from the fact that this employment of forty horsemen would be an altogether amazing and incredible way to set about the murder of a single man, it is to be considered that such a troop, drawn up in the square before St.Peter's, must of necessity have attracted some attention.

It was the first hour of the night, remember--according to Burchard--that is to say, at dusk.

Presumably, too, those horsemen were waiting when the prince arrived.