Emanuele Fenzi (1784–1875), was a leading Italian banker, iron producer, concessionaire of the Livorno–Florence railway and other railway enterprises, merchant for exportation of Tuscan products, and landowner. Made Senator of the Grand Duchy of Tuscany and later of the Kingdom of Italy, Knight of the Sacred Military Order of Saint Stephen, Pope and Martyr, and Knight of the Order of Saint Joseph. He lived in these places: Palazzo di Via San Gallo, Villa Rusciano Villa Fenzi at Sant’Andrea in Percussina, house in the city of Livorno. He was the grandfather of horticulturist Emanuele Orazio Fenzi and the great-grandfather of Ida Fenzi.
He was the son of judge and jurist Cav. Jacopo Orazio Fenzi, after the death of his father (1803) was only nineteen and having already to provide for the family. Having already proved himself a worthy entrepreneur under his fathers guidance, Count Fenzi acquired in 1805 the management of Bosi, Mazzarelli & Co., his entrepreneurial sense was rewarded by the economic success of the company.
In 1810 he bought a building on Corso dei Tintori and married the daughter of a Milanese aristocrat and merchant Countess Ernesta Paffetta dei Lamberti; they had four children. The same year with some fellow members of Bosi, Mazzarelli & Co he founded Bosi, Mazzarelli & Co., specializing in the manufacture and sale of tobacco and gained the monopole of the tobacco industry within the Grand Duchy of Tuscany between 1814 and 1820.
By 1821, Fenzi established the Banca Fenzi, which was soon to branch out all over Italy and Europe. He opened a branch in Piazza della Signoria and from 1829 it acquired a Palazzo on Via San Gallo that was to become the Palazzo Fenzi, that had been put up for sale after the extinction of the Marucelli family.