The Guicciardini came from Poppiana in the Val di Pesa in the XIIth century, and at once took their place among the rich bankers of Florence. Forty-four of the family were Priors and sixteen became Gonfaloniers of Justice, among them Luigi, who was accused of lack of energy at the time of the Ciompi riots. By a whimsical coincidence the mob insisted on knighting him in the Piazza della Signoria, whilst his house was being plundered and burnt. His son Giovanni was Commissary of War with the army of the League in Lombardy and again at Lucca in 1430, when the defeat of the Florentine troops was attributed, not only to his want of prudence, but to his love of gold. He was tried and acquitted; and there is little doubt the accusation was false, promoted by Cosimo de’ Medici whom Luigi had always opposed. Piero Guicciardini on the contrary favoured the ambitious designs of Cosimo, and his son Luigi, when Podestà of Fermo in 1435, captured Antonio Guadagni, the great enemy of the Medici, and sent him to Florence, where he was beheaded. Some years later Francesco Sforza made Luigi Podestà of Milan. With the exception of the few months, during which he was at different epochs Gonfalonier of Justice, most of his life was spent out of Florence as ambassador to various Italian princes and towns. His brother Niccolò married the daughter of the famous condottiere Braccio di Fortebraccio, Lord of Perugia. He was one of the fifteen citizens elected to govern Florence after the death of Leo X. who were dismissed as too republican when Cardinal Giulio de’ Medici arrived in the city. Niccolò was in danger of losing his head after the capitulation of Florence, as he had been one of the most active of the _Dieci di Guerra_ who conducted the defence. His son Braccio, taken prisoner at Montemurlo, was condemned to imprisonment for life in the fortress of Volterra.