An heir apparent is an heir who, short of a fundamental change in the situation, cannot be displaced from inheriting.

An heir presumptive, by contrast, is an heir currently in line to inherit a title, but who could be displaced at any time by certain events.

Today these terms most commonly describe heirs to hereditary titles, particularly monarchies. They are also used metaphorically to indicate an "anointed" successor to any position of power, e.g., a political or corporate leader.

The phrase is only occasionally found used as a title, where it usually is capitalized ("Heir Apparent"). Most monarchies give (or gave) the heir apparent the title of Crown Prince or a more specific title, such as Prince of Orange in the Netherlands, Prince of Asturias in Spain, or Prince of Wales in the United Kingdom. See crown prince for more examples.

This article primarily describes the term heir apparent in a hereditary system regulated by laws of primogeniture— as opposed to cases where a monarch has a say in naming the heir.

Heir apparent versus heir presumptive

Throngs before the Imperial Palace in Japan awaiting the appearance of the Crown Prince Hirohito for the recent proclamation of his official recognition as the heir apparent to the Japanese Imperial Throne -- New York Times, 1916.

In a hereditary system governed by some form of primogeniture, an heir apparent is easily identifiable as the person whose position as first in the line of succession is secure, regardless of future births. An heir presumptive, by contrast, can always be "bumped down" in the succession by the birth of somebody more closely related in a legal sense (according to that form of primogeniture) to the current title-holder.

The clearest example occurs in the case of a title-holder with no children. If at any time they produce children, they (the offspring of the title-holder) rank ahead of whatever more "distant" relative (the title-holder's sibling, perhaps, or a nephew or cousin) previously was heir presumptive.

Many legal systems assume childbirth is always possible, regardless of age or health. The possibility of a fertile octogenarian, though slim in reality, is never ruled out. In such circumstances a person may be, in a practical sense, the heir apparent but still, legally speaking, heir presumptive.

Daughters in male-preference primogeniture

Daughters (and their lines) may inherit titles that descend according to male-preference primogeniture, but only in default of sons (and their heirs). That is, a female has just as much right to a place in the order of succession as a male, but ranks behind her brothers, regardless of their age.

Thus, normally, even an only daughter will not be her father's (or mother's) heiress apparent, since at any time a brother might be born who, though younger, would be heir apparent. Hence, she is an heiress presumptive.

For example, Queen Elizabeth II was heiress presumptive during the reign of her father, King George VI, because at any stage up to his death, George could have fathered a legitimate son. Indeed, when Queen Victoria succeeded her uncle King William IV, the wording of the proclamation even gave as a caveat:

This provided for the possibility that William's wife, Adelaide of Saxe-Meiningen, was pregnant at the moment of his death—since such a child, if born and regardless of the gender of the child, would have displaced Victoria from the throne.[1]

Women as heirs apparent

Obviously, in a system of absolute primogeniture that does not consider gender, female heirs apparent occur. Several European monarchies that have adopted such systems in the last few decades furnish practical examples: Crown Princess Victoria of Sweden is the oldest child of King Carl XVI Gustaf and is his heir apparent; Princess Catharina-Amalia of the Netherlands, Princess Elisabeth of Belgium, and Princess Ingrid Alexandra of Norway are all heirs apparent to their fathers (who are in each case heir apparent to their respective countries' thrones). Victoria was not heiress apparent from birth (in 1977), but gained the status in 1980 following a change in the Swedish Act of Succession. Her younger brother Carl Philip (born 1979) was thus heir apparent for a few months.

But even in legal systems (such as the UK's) that apply male-preference primogeniture, female heirs apparent are by no means impossible: if a male heir apparent dies leaving no sons but at least one daughter, then the eldest daughter would replace her father as heir apparent to whatever throne or title is concerned, but only when it has become clear that the widow of the deceased isn't pregnant. Then, as the representative of her father's line she would place ahead of any more distant relatives. Such a situation has not to date occurred with the English or British throne; several times an heir apparent has died, but each example has either been childless or left a son or sons. However, there have been several female heirs apparent to British peerages (e.g. Frances Ward, 6th Baroness Dudley, and Henrietta Wentworth, 6th Baroness Wentworth).

In one special case, however, England and Scotland had a female heir apparent. The Revolution settlement that established William and Mary as joint monarchs in 1689 only gave the power to continue the succession through issue to Mary II, eldest daughter of the previous king, James II. William, by contrast, was to reign for life only, and his (hypothetical) children by a wife other than Mary would be placed in his original place (as Mary's first cousin) in the line of succession – after Mary's younger sister Anne. Thus, although after Mary's death William continued to reign, he had no power to beget direct heirs,[2] and Anne became the heir apparent for the remainder of William's reign. She eventually succeeded him as Queen of England, Scotland and Ireland.

Displacement of heirs apparent

The position of an heir apparent is normally unshakable: it can be assumed they will inherit. Sometimes, however, extraordinary events—such as the death or the deposition of the parent—intervene.

People who lost heir apparent status

• Parliament deposed James Francis Edward Stuart, the infant son of King James II & VII (of England and Scotland respectively) whom James II was raising as a Catholic, as the King's legal heir apparent—declaring that James had, de facto, abdicated— and offered the throne to James's oldest daughter, the young prince's much older Protestant half-sister, Mary (along with her husband, Prince William of Orange). When the exiled King James died in 1701, his Jacobite supporters proclaimed the exiled Prince James Francis Edward as King James III of England and James VIII of Scotland; but neither he nor his descendents were ever successful in their bids for the throne.
• Crown Prince Gustav (later known as Gustav, Prince of Vasa), son of Gustav IV Adolf of Sweden lost his place when his father was deposed and replaced by his aged uncle, the Duke Carl, who became Charles XIII of Sweden in 1809. The aged King Charles XIII did not have surviving sons, and Prince Gustav was the only living male of the whole dynasty (besides his deposed father), but the prince was never regarded as heir of Charles XIII, although there were groups in the Riksdag and elsewhere in Sweden who desired to preserve him, and, in the subsequent constitutional elections, supported his election as his great-uncle's successor. Instead, the government proceeded to have a new crown prince elected (which was the proper constitutional action, if no male heir was left in the dynasty), and the Riksdag elected first August, Prince of Augustenborg, and then, after the death of the latter, the Prince of Ponte Corvo (Marshal Jean-Baptiste Bernadotte).
• Prince Carl Philip of Sweden, at his birth in 1979, was heir apparent to the throne of Sweden. A year later a change in that country's succession laws instituted absolute primogeniture, and Carl Philip was supplanted as heir apparent by his elder sister Victoria.

Breaching legal qualification of heirs apparent

In some jurisdictions, an heir apparent can automatically lose that status by breaching certain constitutional rules. Today, for example:

• a British Prince of Wales would lose his status as heir apparent if he became a Catholic, or married a Catholic.
• a Crown Prince/Princess of Sweden would lose heir apparent status if they marry without approval of the monarch or, contrary to Swedish law, married the heir to another throne.
• a Dutch Prince or Princess of Orange would lose status as heir to the throne if they married without the approval of the Dutch parliament, or simply renounced the right.
• a Spanish Prince of Asturias would lose status if he married against the express prohibition of the monarch or the Cortes.
• a Belgian Crown Prince or Princess would lose heir apparent status if they married without the consent of the monarch, or became monarch of another country.

Heirs apparent who never inherited the throne

• Sin-ja Hoi, Grand Bonjo of Shang-Hai, eldest son of Ming II of China. Died in Battle against the Mongols at the Siege of Hebei in 805 AD.
• Richard, Duke of Bernay, second son of William I of England. Killed in a riding accident in the New Forest.
• William Adelin (1103–1120) was the only legitimate son of King Henry I of England, who drowned in the White Ship disaster off the coast of Barfleur in the English Channel in 1120. His cousin Stephen allegedly left the ship at the last minute before it sailed. As a direct result of William's death, Stephen later usurped the English throne from William's sister Matilda, leading to the period known as the Anarchy.
• Edward, the Black Prince (1330–1376) was the eldest son of King Edward III of England, and victor of the Battle of Poitiers. He died before his father, who was instead succeeded by the Black Prince's son Richard II.
• Edward of Westminster, Prince of Wales (1453–1471)was the only son of King Henry VI of England. His father was deposed in 1461 and restored to the throne in 1470. Edward was killed at the Battle of Tewkesbury in 1471.
• Arthur, Prince of Wales (1486–1502) was the eldest son of King Henry VII of England and first husband of Catherine of Aragon. His sudden death within four months of his marriage passed the succession to his younger brother, Henry VIII, who also married his widow. The question of whether Catherine had lost her virginity to Arthur was central to Henry's later demand for a marriage annulment, which led to the Protestant Reformation in England.
• Henry Frederick, Prince of Wales (1594–1612) - eldest son of King James I
• Louis, le grand Dauphin (1661–1711) was the son of Louis XIV, King of France and of Navarre. He died before his father, and the throne eventually went to the Grand Dauphin's grandson who became Louis XV
• Yinreng (1674–1725) — Yinreng was an heir apparent to the imperial throne of Qing Dynasty of China. Yinreng was deprived of his position twice by the Kangxi Emperor.
• Louis, Dauphin and Duke of Burgundy (1682–1712) was the eldest son of Louis, le grand dauphin, and grandson of Louis XIV. He died of measles less than a year after his father. His son, Louis XV, ultimately succeeded Louis XIV
• Frederick, Prince of Wales (1707–1751) was the Prince of Wales and heir apparent of George II of Great Britain. He died in 1751, nine years before his father.
• Louis, Dauphin of France (1729–1765) was the son of Louis XV, King of France and Navarre. He died before his father, and the throne eventually went to his son, who became Louis XVI
• Crown Prince Sado of Joseon (Korea) (1735–1762) was heir apparent to King Yeongjo of Joseon (Korea). Because of his lifelong erratic behavior, his father forced him to commit suicide by locking him in a rice chest, where he died in a span of 8 days. Sado's son succeeded his grandfather as King Jeongjo of Joseon.
• Louis-Antoine, Dauphin and Duke of Angoulême (1775–1844) was eldest son and heir apparent of King Charles X of France. Charles, however, abdicated, as did Louis himself, in favour of Louis' nephew the young Henri, only for the throne to be seized by a cousin, King Louis-Philippe of France in 1830.
• Ferdinand Philippe, Duke of Orléans (1810–1842), eldest son of Louis-Philippe of France; a popular young liberal, died in a carriage accident six years before his father's overthrow.
• Prince Leopold, Duke of Brabant (1859–1869), was the only legitimate son of King Leopold II of Belgium, who died from pneumonia, after falling into a pond.
• Philippe, comte de Paris (1838–1894), eldest son of Ferdinand Philippe, Duke of Orléans was heir apparent to his grandfather Louis-Philippe after his father's death. Attempts to put him on the throne after Louis Philippe's abdication were unsuccessful, and he became known as the Orléanist pretender.
• William, Prince of Orange (1843–1879) was the eldest son of William III of the Netherlands by his first wife. Forbidden by his father to marry his chosen bride, he lived a life of debauchery in Paris and predeceased his father.
• Alexander, Prince of Orange (1851–1884), third son of William III of the Netherlands by his first wife, died ,of typhus, before his father.
• Crown Prince Rudolf of Austria (1858–1889) was the only son of Emperor Franz Joseph I of Austria. He committed suicide with his mistress in 1889.
• Crown Prince Luís Filipe of Portugal (1887–1908) was heir apparent to King Carlos. The joint assassination of the king and his heir apparent in 1908 left the throne to the teenage Manuel II of Portugal. Portugal became a republic in 1910.
• Tsarevich Alexei Nikolaevich of Russia (1904–1918) was the youngest child and only son of Tsar Nicholas II of Russia, and heir apparent to the Russian throne. When Nicholas abdicated in March 1917, he also abdicated in the name of his son, which was, in effect, against the law in Russia. However the monarchy was abolished days later, so it made no difference. Alexei was murdered in 1918 along with the rest of his family. For years, many people believed he escaped his killers, since his body hadn't been found. His body, and the bodies of one his sisters, the rest of his family, and his servant were found in 2007.[3]
• Vittorio Emanuele, Prince of Naples (b. 1937) became crown prince of Italy after his father ascended to the throne as Umberto II. His father lost the throne one month later.
• Leka, Crown Prince of Albania (b. 1939) was the son of Zog I who the Italians expelled two days after Leka's birth.
• Crown Prince Amedeo of Savoy, Duke of Aosta (b. 1943) as the son of Tomislav II of Croatia, abdicated due to the Armistice between Italy and Allied armed forces, when Amedeo was only two weeks old.
• Alexander, Crown Prince of Yugoslavia (b. 1945) as the son of Peter II, the Communists deposed when Alexander was only a few months old.

Heirs apparent as of 2009

• HRH Crown Prince Salman bin Hamad bin Isa Al Khalifa is the heir apparent to the throne of Bahrain.
• HRH Prince Philippe, Duke of Brabant is the heir apparent to the throne of Belgium.
• HRH Crown Prince Al-Muhtadee Billah is the heir apparent to the throne of Brunei.
• HRH Crown Prince Frederik of Denmark is the heir apparent to the throne of Denmark.
• Sheikh Hamdan bin Mohammed bin Rashid al Maktoum is the heir apparent to the throne of Dubai.
• HIH Crown Prince Naruhito of Japan is the heir apparent to the Chrysanthemum Throne of Japan.
• HRH Crown Prince Hussein bin Al Abdullah is the heir apparent to the throne of Jordan.
• HRH Crown Prince Nawaf Al-Ahmad Al-Jaber Al-Sabah is the heir apparent to the throne of Kuwait. (He was nominated as such.)
• HRH Prince Lerotholi Seeiso is the heir apparent to the throne of Lesotho.
• HSH Prince Alois of Liechtenstein is the heir apparent to the throne of Liechtenstein.
• HRH Hereditary Grand Duke Guillaume of Luxembourg is the heir apparent to the throne of Luxembourg.
• HRH Crown Prince Moulay Hassan is the heir apparent to the throne of Morocco.
• HRH Prince Willem-Alexander, Prince of Orange is the heir apparent to the throne of the Netherlands.
• HRH Crown Prince Haakon of Norway is the heir apparent to the throne of Norway.
• HRH Sheikh Tamim Bin Hamad Al Thani is the heir apparent to the throne of Qatar.
• HRH Crown Prince Sultan bin Abdul Aziz al-Saud is the heir apparent to the throne of Saudi Arabia.
• HRH Prince Felipe, Prince of Asturias is the heir apparent to the throne of Spain.
• HRH Crown Princess Victoria, Duchess of Västergötland is the heiress apparent to the throne of Sweden.
• HRH Crown Prince Maha Vajiralongkorn is the heir apparent to the throne of Thailand.
• HRH The Prince Charles, Prince of Wales is equally the heir apparent to the United Kingdom and the fifteen other Commonwealth realms.

Notes