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The list includes all individuals who were first in line to the throne of Italy, either as heir apparent or as heir presumptive, since 1861. Those who actually succeeded to the throne are shown in bold.
| Monarch | Heir | Relationship to monarch | Became heir (Date; Reason) | Ceased to be heir (Date; Reason) | Next in line of succession |
|---|---|---|---|---|---|
| Vittorio Emanuele II | Prince Umberto, Prince of Piedmont | Son | 17 March 1861 Father proclaimed king of Italy | 9 January 1878 Father died, became king | Prince Amedeo, Duke of Aosta, 1861–1869, brother |
| Prince Vittorio Emanuele, Prince of Naples , 1869–1878, son | |||||
| Umberto I | Prince Vittorio Emanuele, Prince of Naples | Son | 9 January 1878 Father became king | 29 July 1900 Father assassinated, became king | Prince Amedeo, Duke of Aosta, 1878–1890, uncle |
| Prince Emanuele Filiberto, Duke of Aosta, 1890–1900, first cousin | |||||
| Vittorio Emanuele III | Prince Emanuele Filiberto, Duke of Aosta | First cousin | 29 July 1900 First cousin became king | 15 September 1904 Son born to king | Prince Amedeo, Duke of Apulia, son |
| Prince Umberto, Prince of Piedmont | Son | 15 September 1904 Born | 9 May 1946 Father abdicated, became king | Prince Emanuele Filiberto, Duke of Aosta, 1904–1931, first cousin once removed | |
| Prince Amedeo, Duke of Aosta, 1931–1937, second cousin | |||||
| Prince Vittorio Emanuele, Prince of Naples, 1937–1946, son | |||||
| Umberto II | Prince Vittorio Emanuele, Prince of Naples | Son | 9 May 1946 Father became king | 12 June 1946 Monarchy abolished by referendum | Prince Aimone, Duke of Aosta, second cousin once removed |
The House of Romanov was the reigning imperial house of Russia from 1613 to 1917. They achieved prominence after Anastasia Romanovna married Ivan the Terrible, the first crowned tsar of all Russia. Nicholas II, the last Emperor of Russia, and his immediate family were executed in 1918, but there are still living descendants of other members of the imperial house.
The Capetian House of Valois was a cadet branch of the Capetian dynasty. They succeeded the House of Capet to the French throne, and were the royal house of France from 1328 to 1589. Junior members of the family founded cadet branches in Orléans, Anjou, Burgundy, and Alençon.
Dauphin of France, originally Dauphin of Viennois, was the title given to the heir apparent to the throne of France from 1350 to 1791, and from 1824 to 1830. The word dauphin is French for dolphin and was the hereditary title of the ruler of the Dauphiné of Viennois. While early heirs were granted these lands to rule, eventually only the title was granted.
Duke of Cornwall is a title in the Peerage of England, traditionally held by the eldest son of the reigning British monarch, previously the English monarch. The Duchy of Cornwall was the first duchy created in England and was established in a royal charter in 1337 by King Edward III. As of 2022, Prince William became Duke of Cornwall following the accession to the throne of his father, King Charles III; William's wife, Catherine, became Duchess of Cornwall.
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The Crown Prince of Thailand is a title held by the heir apparent to the Thai throne. It was created by King Chulalongkorn in 1886, for his son Prince Maha Vajirunhis, the king's eldest son by a royal wife Queen Savang Vadhana. Prior to this, the Siamese throne did not have a law or formal system regulating royal succession. In 1688, King Phetracha of Ayutthaya created the title of Front Palace, which by the Rattanakosin period had become the main title granted to the heir presumptive to the throne. However, few Front Palaces succeeded to the throne this way, with the exception of King Phutthaloetla Naphalai in 1809. After the death of Bowon Wichaichan in 1885, the title of Front Palace was abolished and replaced with the title of Crown Prince, who became heir apparent to the throne.
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