[1] In 1571 he went to Vienna, Venice, Turin, Florence and in 1573 to Naples, where he subsequently joined the expedition of Don Juan to re-conquer Tunis for the Spanish.
The first record of Brancaccio being at the court of Alfonso d'Este II in Ferrara is in 1577, singing with the ladies of the first period of the Concerto delle donne, the amateurs Lucrezia Bendidio, Leonora Sanvitale, and Vittoria Bentivoglio.
In 1581 he published a translation and commentary on Julius Caesar's Commentarii de Bello Gallico in Venice, which survives in printings from 1581, 1582 (Vittorio Baldini), and 1585 (Aldo Manuzzio).
Brancaccio was brought to the court at Ferrara by Duke Alfonso II d'Este specifically to sing for his musica secreta, where he was highly prized as a skilled bass.
In 1581, he was out of favor with the court, or more specifically the Duke because of his absence in Venice, where he was arranging the Venetian printing of his 'Commentarii de Bello Gallico'.