By his marriage with Caterina del Balzo Orsini, his family obtained the title of counts of Conversano, which they retained until the early nineteenth century.
It was an interesting example of renaissance ideal city, applying the theory of the most important architects of the time, as Leon Battista Alberti and Francesco Di Giorgio Martini.
In 1478 he commanded the fleet that supported the Neapolitan army of King Ferrante of Aragon, which had joined the coalition formed by Pope Sixtus IV against the Republic of Florence.
The body is buried, together with his wife, in the church of Santa Maria dell'Isola in Conversano, in a funeral monument by the Apulian sculptor Nuzzo Barba.
[1] Giulio Antonio died at Minervino di Lecce, and was succeeded in Conversano by his son Andrea Matteo.