Erasmo Stefano of Narni (1370 – 16 January 1443), better known by his nickname of Gattamelata (meaning "Honeyed Cat"), was an Italian condottiero of the Renaissance.

Later, together with his friend Brandolino Brandolini, he served under Braccio da Montone, one of the leading Italian condottieri of the 15th century,[3] lord of Perugia from 1416.

With Braccio, he participated in the conquest of Todi, Rieti, Narni, Terni and Spoleto, and, in 1419, in the battle of Viterbo against Muzio Attendolo.

[3] At the War of L'Aquila (June 1424), Braccio's army was utterly defeated, and the condottiero himself killed; Erasmo led the remaining troops into the service of the Republic of Florence.

[3] Città di Castello fell in 1428, but Erasmo had moved to the northern Papal States to counter the rebellion of Imola, Forlì and Bologna.

His second marriage was to Margherita Scotti, which showed that Sigismondo was a sufficiently important personality to be able to form an alliance with the most notable family in Piacenza.