Duke of Aosta
In the mid-13th century the Holy Roman Emperor, Frederick II, made the County of Aosta a duchy; its arms were carried in the Savoyard coat of arms until the unification of Italy in 1870. The region remained part of Savoy lands, with the exception of a French occupation, 1539–1563. The title Duke of Aosta was given to various princes of the dynasty of Sardinia, second sons of the reigning monarch. It can be compared to the English Duke of York, French Duke of Orléans, Swedish Duke of Södermanland and the Scottish Duke of Albany. It remained in the branch of Prince Amedeo of Savoia, the second son of king Victor Emanuel II of Italy, as he was the first ever cadet prince Duke of Aosta who left male heirs. The subsidiary titles of the Duke of Aosta are, from the heritage of Maria Vittoria dal Pozzo, the mother of Duke Emanuele Filiberto, Prince della Cisterna and of Belriguardo, Marquess of Voghera, and Count of Ponderano. Ponderano was created in 1559, Voghera in 1618; Cisterna and Belriguardo as princely in 1670. The title has been used since July 2006 by Amedeo's son Prince Aimone, Duke of Apulia, who is married to Princess Olga of Greece, younger daughter of Prince Michael of Greece and Denmark.
Duke of Aosta, 1701–1715
Duke of Aosta, 1723–1725
Duke of Aosta, 1731–1735
| Name | Portrait | Birth | Marriages | Death |
| Prince Emanuele Filiberto 1731-1735 | 17 May 1731 Royal Palace of Turin second son of Charles Emmanuel III and Polyxena of Hesse-Rotenburg | never married | 23 April 1735 Royal Palace of Turin aged 3 |
Duke of Aosta, 1738–1745
| Name | Portrait | Birth | Marriages | Death |
| Prince Carlo Francesco 1738-1745 | 1 December 1738 Royal Palace of Turin eldest son of Charles Emmanuel III and Elisabeth Therese of Lorraine | never married | 25 March 1745 Royal Palace of Turin aged 6 |
Duke of Aosta, 1759–1802
| Name | Portrait | Birth | Marriages | Death |
| Prince Vittorio Emanuele 1759-1802 | 24 July 1759 Royal Palace of Turin second son of Victor Amadeus III and Maria Antonia Ferdinanda of Spain | Maria Theresa of Austria-Este 25 April 1789 Royal Palace of Turin seven children | 10 January 1824 Castle of Moncalieri aged 64 |
Duke of Aosta, 1845–present
| Name | Portrait | Birth | Marriages | Death |
| Prince Amedeo 1845-1890 | 30 May 1845 Royal Palace of Turin second son of Victor Emmanuel II and Adelaide of Austria | Maria Vittoria dal Pozzo 30 May 1863 Royal Palace of Turin three sons Maria Letizia Bonaparte 11 September 1888 Royal Palace of Turin one son | 18 January 1890 Royal Palace of Turin aged 44 | |
| Prince Emanuele Filiberto 1890-1931 | 13 January 1869 Genoa eldest son of Amedeo and Maria Vittoria dal Pozzo | Hélène d'Orléans 25 June 1895 Church of St. Raphael, Kingston upon Thames two sons | 4 July 1931 Royal Palace of Turin aged 62 | |
| Prince Amedeo 1931-1942 | 21 October 1898 Royal Palace of Turin eldest son of Emanuele Filiberto and Hélène d'Orléans | Anne d'Orléans 5 November 1927 Naples two daughters | 3 March 1942 Nairobi aged 43 | |
| Prince Aimone 1942-1948 | 9 March 1900 Royal Palace of Turin second son of Emanuele Filiberto and Hélène d'Orléans | Irene of Greece and Denmark 1 July 1939 Florence one son | 29 January 1948 Buenos Aires aged 47 | |
| Prince Amedeo 1948-present | 27 September 1943 Florence only son of Aimone and Irene of Greece and Denmark | Claude d'Orléans 22 July 1964 Sintra, Portugal three children Silvia Paternò di Spedalotto 30 March 1987 Villa Spedalotto no issue | living | |
| Prince Aimone, Duke of Apulia Ducal heir | 13 October 1967 Florence first son of Amedeo | Olga of Greece 27 September 2008 Patmos, Greece three children | living |