Prince Emanuele Filiberto Vittorio Eugenio Alberto Genova Giuseppe Maria di Savoia, 2nd Duke of Aosta was an Italian general and member of the House of Savoy, as the son of Amadeo I, and was also a cousin of Victor Emmanuel III of Italy. Filiberto was also commander of the Italian Third Army during World War I, which earned him the title of the "Undefeated Duke". After the war he became a Marshal of Italy.

Amadeo I, also known as Amadeus, was an Italian prince who reigned as King of Spain from 1870 to 1873. The only king of Spain to come from the House of Savoy, he was the second son of Victor Emmanuel II of Italy and was known for most of his life as the Duke of Aosta, the usual title for a second son in the Savoyard dynasty.