The Florentine banking family of the Gondi were prominent financial partners of the Medici. Unlike the Medici, they were of the old Florentine nobility, tracing their line traditionally from the legendary Philippi, said to have been ennobled by Charlemagne himself, in 805; from him the Strozzi and the Gualfreducci also claimed their descent. With Orlando Bellicozzo, a member of the Great Council of Florence in 1197, the Gondi emerge into history, receiving their patronymic from Gondo Gondi, sitting on the Great Council in 1251, signatory to a treaty between Florence and Genoa in that year. In the fourteenth century several members of the family sat on the Great Council. Simon de Gondi renounced the Ghibelline party for himself and his house, in 1351; he loaned the Republic 8000 golden florins in a time of extremity. He held extensive lands round Valcava, in the Mugello, where the church bore the Gondi arms inside and out. Of Simon's seven children, his grandson another Simon was the first of the Gondi to hold the position of Grand Prior of the Republic, on three occasions. His daughter Maddalena, who married Giovanni Salviati, by the marriage of her daughter Maria with Giovanni dalle Bande Nere, became the grandmother of Cosimo I de' Medici; thence were descended all the Catholic crowned heads of pre-Napoleonic Europe. Carlo de Gondi was a staunch backer of Piero de' Medici, and when the Medici came to be Grand Dukes, the Gondi received empty but honorary titles of Senators.
The Palazzo Gondi in Piazza San Firenze, Florence, the central seat of the family, was rebuilt in 1501 to designs of Giuliano da Sangallo for Giuliano Gondi; it later passed to the Orlandini. The cortile is enclosed by colonnaded loggias; the staircase is remarkable for its fine balustrade infilled with animals and foliage. At the head of the interior staircase, leading to the principal apartments, is the statue of the Roman senator, taken from the supposed Temple of Isis. The chimneypiece of the salone is assumed to be the work of Giuliano da San Gallo.
Giuliano, who built the palazzo, had refused a pension offered him by the King of Naples, because he did not consider that the citizen of a free republic could accept money from a foreign prince with honour. His son completed the structure and commissioned the Gondi chapel in Santa Maria Novella.His descendants, nevertheless, were frequently in the pay of France, and were created French generals, admirals, governors of provinces, and even archbishops and Jean François Paul de Gondi, cardinal de Retz. Giovanni Battista Gondi was the Florentine resident in Paris in the 1620s.