He was, as Macchiavelli says, a secret man, and the more dangerous for his closeness, since he never let it be known what he intended until he had executed his designs.
Guicciardini, of course, has called the Sinigaglia affair a villainy ("scelleragine") whilst Fabio Orsini and a nephew of Vitelli's who escaped from Sinigaglia and arrived two days later at Perugia, sought to engage sympathy by means of an extraordinary tale, so alien to all the facts--apart from their obvious reasons to lie and provoke resentment against Cesare--as not to be worth citing..