Borghese was the second son of the prince and, as such, had the title of Patrician of Rome, Naples and Venice and the style of Don Junio Valerio Borghese. However, the press and the Anglo-Saxon historiography routinely used the incorrect style Prince Junio Valerio Borghese. Borghese was first educated in London, England, and, from 1923, he attended the Royal Italian Navy Academy (Accademia Navale) in Livorno.