Michelangelo Caetani (1804-1882), Duke of Sermoneta, was a significant patron of Castellani with a considerable private fortune. He amassed a substantial collection of jewels and objects from the firm, as well as being an enthusiastic and talented jewellery designer in his own right, supplying Castellani with drawings for numerous important commissions: Most notably the gold presentation swords given to Napoleon III and to Victor Emmanuel II from the people of Rome, as well as a gold chalice presented to Pope Pius IX.
Caetani’s marriage to his third wife Enrichetta Ellis, daughter of Lord Howard de Walden, provided Castellani with powerful connections to the English aristocracy. The patronage of the third Duke of Wellington, Countess Granville as well as Robert and Elizabeth browning were presumably won through Cateani’s influence.
In a letter written to Alessandro Castellani, Caetani enclosed a design for a bracelet he wished to give to his future wife on their wedding day. The singular design of the band and distinctive barrel shaped clasp are identical to the bracelet above.