It seems that Alexander VI had already reached an agreement with Cybo over the two fortresses and their unexpected purchase by his chief vassal with Neapolitan money (40,000 ducats) was considered by the Pope as an act of treason.
Alexander VI had already reached an agreement with Cybo over the two fortresses, and his chief vassal's unexpected purchase of them using Neapolitan funds (40,000 ducats) was viewed by the Pope as a betrayal.