In 1415 he was jailed in the Castel Nuovo of Naples together with his father and his brothers. Leone fought mainly alongside Francesco, and in 1432 he escorted to Piacenza the emperor Sigismund. In 1434–1435 he fought against Niccolò Fortebraccio in Lazio and Umbria: taken prisoner, he was freed after the death of that condottiero.
Leone Sforza was killed during the siege of Caravaggio of 1440, while commanding the Venetian troops.
- Page at condottieridiventura.it (Italian)