A chancellor of Count Girolamo was hung at the windows of the Bargello. He had been captured by one of the Altoviti,(1) who was a proscribed rebel, and in order to be pardoned, found out this man, and caught him between Piombino and Pisa; and he won his pardon.
(1) This must have been the famous Cola Montano, a Bolognese; not a chancellor, but maintained by Count Girolamo Riario, and the Pope, and the King of Naples, and all the enemies of Florence, during the war following the Conspiracy of the Pazzi. That he was taken by one of the Altoviti is not mentioned elsewhere. Brought to Florence, he was put in the prison of the Bargello or Captain of the Piazza dei Signori; where he wrote with his own hand a Confessione, which is preserved in the State Archives of Florence, amongst the Carte Strozziane, still unedited, but well worth publishing, as important contributions to the history of that time. The order of the Signori e Collegi to the Otto di Custodia e Balia, of the 12th March, for the execution of Montano, still exist in the said archives amongst the papers of these magistrates. (Trans.)
Leonardo's work on the cartoon of the Battle of Anghiari was suddenly interrupted in the last months of 1504, and he went to Piombino on a somewhat official mission as a military architect. (During his absence Michelangelo was to receive the commission for the Battle of Cascina.) His mission was preceded by a diplomatic action conducted by Machiavelli himself. It can be inferred, therefore, that it was Machiavelli who suggested Leonardo's name for the programme of fortification projects suggested by Jacopo IV Appiano, Lord of Piombino, an ally of the Florentines at the time of the Pisian war, 1503-4, when Leonardo had already been consulted on the project of diverting the Arno River for strategic reasons, and when Antonio da Sangallo the Elder was the chief military architect of the Florentine Republic. Leonardo's activity at Piombino, revealed by newly discovered evidence, included the study of the city walls, the citadel and the main gate.