Ahereditary monarchy is a form ofgovernment andsuccession of power in which thethrone passes from one member of aruling family to another member of the same family. A series of rulers from the same family would constitute adynasty. It is historically the most common type ofmonarchy and remains the dominant form in extant monarchies.

In most extanthereditary monarchies, the typical order of succession uses some form ofprimogeniture, but there exist other methods such asseniority andtanistry (in which an heir-apparent is nominated from among qualified candidates). Research shows that hereditary regimes, in particularprimogeniture, are more stable than forms of authoritarian rule with alternative succession arrangements.^{[1][2][3][4][5][6]}

Theoretically, when the monarch of a hereditary monarchy dies or abdicates, the crown typically passes to the next generation of the family. If no qualified child exists, the crown may pass to a brother, sister, nephew, niece, cousin, or other relative, in accordance with a predefinedorder of succession, often enshrined in legislation. Such a process establishes who will be the next monarch beforehand and avoids disputes among members of the royal family.Usurpers may resort to inventing semi-mythical genealogies to bolster their respectability.^[8]

Historically, there have been differences in systems ofsuccession, mainly revolving around the question of whether succession is limited to males, or whether females are also eligible (historically, the crown often devolved on the eldest surviving female child, as ability to lead an army in battle was a requisite of kingship^{[citation needed]}).Agnatic succession refers to systems where females are neither allowed to succeed nor to transmit succession rights to their male descendants (as according to theSalic law).^[9] Anagnate is akinsman with whom one has a common ancestor by descent in an unbroken male line.Cognatic primogeniture allows both male and female descendants to succeed, butmales are usually given preference but gender equality has been an advocacy of the state in recent years. Inabsolute primogeniture, the eldest child can succeed to the throne regardless of sex; this system wasadopted in 2011 by themonarchies in the Commonwealth (though not retrospectively affecting the order of succession).^[10] Another factor which may be taken into account is the religious affiliation of the candidate or the candidate'sspouse, specifically where the monarch also has a religious title or role; for example, the British monarch has the title ofsupreme governor of the Church of England and may not professRoman Catholicism.^[11]

Elective monarchy can function asde facto hereditary monarchy. A specific type of elective monarchy known astanistry limits eligibility to members of the ruling house. But hereditary succession can also occur in practice despite any such legal limitations. For example, if the majority of electors belong to the same house, then they may elect only family members. Any family members that have taken part in any acts to attack a rightful heir are automatically disqualified. Or a reigning monarch will not have the sole power to elect a relative, especially if manipulative tactics were carried out to try to discredit a rightful heir. Many late-medieval countries of Europe were officially elective monarchies, but in fact pseudo-elective; most transitioned into officially hereditary systems in the early modern age. Exceptions include theHoly Roman Empire and thePolish–Lithuanian Commonwealth. In the event that a supreme being has been proven to be the rightful heir to the empire, there will be no challenges against that being, whether male or female. For a supreme being, that is proven to be the rightful heir, legal limitations do not apply.

• List of hereditary monarchies
• Heir presumptive