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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 |
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 by a royal charter in 1337. Prince William became Duke of Cornwall following the accession of his father, King Charles III, to the throne in 2022, and his wife, Catherine, became Duchess of Cornwall.
Primogeniture is the right, by law or custom, of the firstborn legitimate child to inherit the parent's entire or main estate in preference to shared inheritance among all or some children, any illegitimate child or any collateral relative. In most contexts, it means the inheritance of the firstborn son ; it can also mean by the firstborn daughter, or firstborn child.
An heir apparent or simply heir is a person who is first in an order of succession and cannot be displaced from inheriting by the birth of another person. A person who is first in the current order of succession but could be displaced by the birth of a more eligible heir is known as heir presumptive.
A crown prince or hereditary prince is the heir apparent to the throne in a royal or imperial monarchy. The female form of the title is crown princess, which may refer either to an heiress apparent or, especially in earlier times, to the wife of the person styled crown prince.
An heir presumptive is the person entitled to inherit a throne, peerage, or other hereditary honour, but whose position can be displaced by the birth of a person with a better claim to the position in question. This is in contrast to heirs apparent, whose claim on the position cannot be displaced in this manner.
The House of Stuart, originally spelled Stewart, was a royal house of Scotland, England, Ireland and later Great Britain. The family name comes from the office of High Steward of Scotland, which had been held by the family progenitor Walter fitz Alan. The name Stewart and variations had become established as a family name by the time of his grandson Walter Stewart. The first monarch of the Stewart line was Robert II, whose male-line descendants were kings and queens in Scotland from 1371, and of England, Ireland and Great Britain from 1603, until 1714. Mary, Queen of Scots (r.1542-1567), was brought up in France where she adopted the French spelling of the name Stuart.
The title Duke of Braganza in the House of Braganza is one of the most important titles in the peerage of Portugal. Starting in 1640, when the House of Braganza acceded to the throne of Portugal, the male heir of the Portuguese Crown were known as Duke of Braganza, along with their style Prince of Beira or Prince of Brazil. The tradition of the heir to the throne being titled Duke of Braganza was revived by various pretenders after the establishment of the Portuguese Republic on 5 October 1910 to signify their claims to the throne.
Tsesarevich was the title of the heir apparent or presumptive in the Russian Empire. It either preceded or replaced the given name and patronymic.
A pretender is someone who claims to be the rightful ruler of a country although not recognized as such by the current government. The term is often used to suggest that a claim is not legitimate. The word may refer to a former monarch or a descendant of a deposed monarchy, although this type of claimant is also referred to as a head of a house.
Succession to the British throne is determined by descent, sex, legitimacy, and religion. Under common law, the Crown is inherited by a sovereign's children or by a childless sovereign's nearest collateral line. The Bill of Rights 1689 and the Act of Settlement 1701 restrict succession to the throne to the legitimate Protestant descendants of Sophia of Hanover who are in "communion with the Church of England". Spouses of Catholics were disqualified from 1689 until the law was amended in 2015. Protestant descendants of those excluded for being Roman Catholics are eligible.
The Portuguese succession crisis of 1580 came about as a result of the deaths of young King Sebastian I of Portugal in the Battle of Alcácer Quibir in 1578 and his successor and great-uncle Henry I in 1580. As Sebastian and Henry had no immediate heirs, these events prompted a dynastic crisis, with internal and external battles between several claimants to the Portuguese throne. Sebastian's body was never found and so several impostors emerged over several years claiming to be the young king, further confusing the situation. Ultimately, Philip II of Spain gained control of the country, uniting the Portuguese and Spanish Crowns in the Iberian Union, a personal union that endured 60 years, during which time the Portuguese Empire declined, being challenged globally during the Dutch–Portuguese War.
Infanta Catherine of Portugal, Duchess of Braganza by marriage was a Portuguese infanta (princess) claimant to the throne following the death of King Henry of Portugal in 1580.
A substantive title is a title of nobility or royalty acquired either by individual grant or by inheritance. It is to be distinguished from a title shared among cadets, borne as a courtesy title by a peer's relatives, or acquired through marriage.
The Palace Law of Succession, Buddhist Era 2467 (1924) governs succession to the Throne of the Kingdom of Thailand, under the ruling House of Chakri. Succession matters prior to the end of absolute monarchy in 1932 could be contentious, especially during the Ayutthaya period from the 14th to 18th centuries. In 1924, King Vajiravudh attempted to clarify the succession process by laying down the Palace Law of Succession. It was promulgated and came into effect in November 1924 as, in part, an attempt to eliminate the vagueness relating to succession within the Thai monarchical regime and to systematically resolve previous controversies. In 1932, after Siam became a constitutional monarchy, various amendments relating to succession were introduced. The 1997 Constitution of Thailand relied on the law with regards to succession, but the 2006 Interim Constitution made no mention of succession, leaving it to "constitutional practice". The 2007 Constitution again relied on the Palace Law. The preamble of the 2014 interim constitution of Thailand abrogated the 2007 Constitution, with the exception of chapter 2, concerning the monarchy and the succession.
An order of succession or right of succession is the line of individuals necessitated to hold a high office when it becomes vacated, such as head of state or an honour such as a title of nobility. This sequence may be regulated through descent or by statute.
In inheritance, a hereditary successor is a person who inherits an indivisible title or office after the death of the previous title holder. The hereditary line of succession may be limited to heirs of the body, or may pass also to collateral lines, in case of extinction of heirs of the body, depending on the succession rules. These concepts are in use in English inheritance law.
The Crown Prince of Thailand is a title held by the heir apparent to the Thai throne. First 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 the royal succession. In 1688 King Petracha 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 have succeeded to the throne this way, with the exception of King Buddha Loetla Nabhalai in 1809. After the death of Bovorn 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.
The Crown Prince of Jordan is the heir apparent or heir presumptive to the throne of Jordan.