
A dynasty is a sequence of rulers from the same family. The term is typically used in the context of a monarchical system, but sometimes also appearing in republics. A "house" refers to a ruling royal or noble family.
The word "dynasty" (from the Greek: δυναστεία, dynasteía "power", "lordship", from dynástes "ruler") The Ancient Greek dynasteia referred to sovereignty in general, and was used to describe the rule of various petty rulers. Aristotle used it to refer to an oligarchical regime ruled by the best families. The historian Manetho used the term to refer to a series of kings.
The dynastic family or lineage may be known as a "noble house", which may be styled as "imperial", "royal", "princely", "ducal", "comital" or "baronial", depending upon the chief or present title borne by its members, but it is more often referred by adding the name afterwards, as in "House of Habsburg".

A ruler from a dynasty is sometimes referred to as a "dynast", but this term is also used to describe any member of a reigning family who retains a right to succeed to a throne.
The German aristocrat Prince Ernst August of Hanover, a male-line descendant of King George III, possesses no legal British name, titles or styles (although he is entitled to reclaim the former royal dukedom of Cumberland). He was born in the line of succession to the British throne and was bound by Britain's Royal Marriages Act 1772 until it was repealed when the Succession to the Crown Act 2013 took effect on 26 March 2015. Thus, he requested and obtained formal permission from Queen Elizabeth II to marry the Roman Catholic Princess Caroline of Monaco in 1999. Yet, a clause of the English Act of Settlement 1701 remained in effect at that time, stipulating that dynasts who marry Roman Catholics are considered "dead" for succession to the British throne. That exclusion, too, ceased to apply on 26 March 2015, with retroactive effect for those who had been dynasts before triggering it by marriage to a Roman Catholic.

A "dynastic marriage" is one that complies with monarchical house law restrictions, so that the descendants are eligible to inherit the throne or other royal privileges. For example, the marriage of King Willem-Alexander of the Netherlands to Máxima Zorreguieta in 2002 was dynastic, making their eldest child, Princess Catharina-Amalia, the heir apparent to the Crown of the Netherlands. The marriage of his younger brother, Prince Friso of Orange-Nassau, in 2003 lacked government support and parliamentary approval. Thus, Prince Friso forfeited his place in the order of succession to the Dutch throne, and consequently lost his title as a "Prince of the Netherlands", and left his children without dynastic rights.
The Pragmatic Sanction of 1713 was an edict issued by Holy Roman Emperor Charles VI on 19 April 1713 to ensure that the Habsburg monarchy could be inherited by his daughter undivided (see agnatic-cognatic primogeniture). In 1736, Francis Stephen of Lorraine married Archduchess Maria Theresa of Austria, the sole heir of Emperor Charles VI. With the marriage of Maria Theresa, the only offspring of the House of Austria, she became together with her husband the founder of the new dynasty of the House of Habsburg-Lorraine. Since 1740 he was her co-regent in the Habsburg hereditary lands and from 1745 he was Holy Roman Emperor as Francis I, but was hardly involved in government affairs. Francis was as Duke of Lorraine the last non-Habsburg monarch of the Holy Roman Empire. The couple were the founders of the Habsburg-Lorraine dynasty, which ruled until 1918. Empress Maria Theresa of the Habsburg dynasty had her children married into various European dynasties. Habsburg marriage policy amongst European dynasties led to the Pax Austriaca.
Monarchies were based on the idea that power was best kept in families. Hereditary succession reduced the risk associated with a lack of a designated heir.

Dynasties lasting at least 200 years include the following.
| Dynasty | Years ruled | Corrected length of rule | Notes |
|---|---|---|---|
| Pandya | c. 400 BCE – 1618 CE | c. 2018 years | Non-continuous; disappeared from historical record during Kalabhra dynasty rule from around 361–560 CE. Excluding the Kalabhra interlude, the Pandyas ruled for c. 1819 years. |
| Imperial House of Japan | c. 500 – present | c. 1,500+ years | Continuous, mostly ceremonial since 12th century; pre-500 CE emperors semi-legendary, exact start uncertain |
| Wessex/England/United Kingdom | c. 520 – present | c. 1,500 years | Non-continuous; deposed in 1066, de facto interregnum 1649–1660; survived through marriages and cadet branches |
| Guhila / Sisodia | c. 525 – 1971 | c. 1,500 years | Agnatic dynasty of the Kingdom of Mewar; ceremonial after 1949 |
| Chera | c. 200 BCE – 1100 CE | c. 1,300 years | Estimation; fragmented early records, gaps likely |
| Velir | c. 50–1300; 1400–1751; 1803–1948 | c. 1,250 years | Non-continuous; independently ruling Malyaman branch ended in 1300 CE; surviving descendant Pari family ceremonial under British paramountcy (dynasty ruled for 1,746 years) |
| Tonga | c. 950 – present | c. 1,075 years | Estimation; title changed in 1865, now constitutional |
| Capetian | 987–present | 1,038 years | Continuous through cadet branches (e.g., Bourbon); active in Spain |
| Bagrationi | 780–1801 | c. 1,021 years | Georgian royal house; ended with Russian annexation |
| Silla | 57 BCE – 935 CE | 992 years | Korean kingdom; estimate for early start |
| Adaside | c. 1700 – 722 BCE | 978 years | Neo-Assyrian period; estimation |
| Eastern Ganga | 498–1434 | c. 936 years | Odisha rulers; diminished after 1434 |
| Baduspanids | 665–1598 | 933 years | Rulers of Tabaristan |
| Chola | c. 300 BCE – 200 CE; 848–1279 CE | c. 929 years | Non-continuous; interregnum c. 200–848; early period semi-legendary |
| Borjigin | c. 1130–1930 | c. 800 years | Continuous through cadet branches (e.g., Taichiud, Tughlugh-Timurids); rulers of the Mongol Empire and successor states |
| Zhou | 1046–256 BCE | 790 years | Nominal rule in later Warring States period; traditional dates |
| Abbasid | 750–1258, 1261–1517 | 764 years | Non-continuous; caliphal rule, ceremonial after 1258 |
| Rurikid | 862–1598 | 736 years | Kievan Rus' to Tsardom of Russia |
| Sayfawa | c. 1085 – 1846 | c. 761 years | Kanem–Bornu Empire; estimation |
| Grimaldi | 1297–present | 729 years | Reigning Princes of Monaco |
| Goguryeo | 37 BCE – 668 CE | 705 years | Korean kingdom; well documented |
| Solomon | 1270–1975 | 705 years | Ethiopian emperors; restored in 1270 |
| Bavand dynasty | 651–1349 | 698 years | Rulers of Tabaristan |
| Kachhwaha | 1128–1818 | 690 years | Jaipur rajputs; effective rule ended with British control |
| Bolkiah | c. 1360 – present | c. 665 years | Sultans of Brunei; estimation for early start |
| Ottoman | 1299–1922 | 623 years | Sultans of the eponymous beylik, later empire |
| Vijaya | 543 BCE – 66 CE | 609 years | Sri Lankan kings; traditional dates |
| Ahom | 1228–1826 | 598 years | Assamese kingdom |
| Oldenburg | 1448–present | 577 years | Danish/Norwegian monarchs; active in Denmark |
| Rathore | 1243–1818 | 575 years | Marwar/Jodhpur rajputs; ended with British control |
| Bohkti | c. 1330 – 1855 | c. 525 years | Kurdish principality; adjusted start date |
| Joseon and Korean Empire | 1392–1910 | 518 years | Korean rulers |
| Habsburg | 1278–1780 | 502 years | Agnatic line; all are extinct after the death of Maria Theresa. |
| Shang | 1600–1046 BCE | 496 years | Chinese royal rulers |
| Goryeo | 918–1392 | 474 years | Korean kingdom |
| Arsacid | 247 BCE – 224 CE | 471 years | Parthian Empire |
| Nabhani | 1154–1624 | 470 years | Omani imams |
| Han and Shu Han | 202 BCE – 9 CE, 25–220 CE | 448 years | Non-continuous; Chinese emperors |
| Árpád | 858–1301 | 443 years | Kings of Hungary |
| Mataram | 1586–present | c. 439 years | Indonesian sultans; estimation for continuity |
| Přemyslid | 870–1306 | c. 436 years | Czech dukes and kings of Bohemia |
| Sassanian | 224–651 | 427 years | Persian Empire |
| Davidic | c. 1010–586 BCE | c. 424 years | Kingdom of Judah; traditional dates |
| Jafnid | 220–638 | 418 years | Arab kingdom |
| Piast | 960–1370 | 410 years | Dukes and kings of Poland |
| Argead | c. 700 – 309 BCE | c. 391 years | Macedonian kings; adjusted start |
| Copán | 426–810 | 384 years | Maya city-state |
| Siri Sanga Bo | 1220–1597 | 377 years | Kandy kingdom, Sri Lanka |
| Umayyad | 661–750, 756–1031 | 364 years | Non-continuous; caliphs |
| Yuan and Northern Yuan | 1271–1635 | 364 years | Mongol China |
| Komnenos | 1057–1059, 1081–1185, 1204–1461 | 363 years | Byzantine emperors; non-continuous |
| Later Lê (Primitive and Revival Lê) | 1428–1527, 1533–1789 | 355 years | Vietnamese emperors; non-continuous |
| Estridsen | 1047–1375, 1387–1412 | 353 years | Kings of Denmark; non-continuous |
| Aryacakravarti | 1277–1619 | 342 years | Jaffna kingdom |
| Lakhmid | c. 268–602 | c. 334 years | Arab kingdom |
| Stuart | 1371–1651, 1660–1714 | 334 years | Scottish/British monarchs; de jure continuous |
| Mughal | 1526–1857 | 331 years | Mughal Empire; cadet branch of Timurid dynasty |
| Plantagenet | 1154–1485 | 331 years | Kings of England |
| Jiménez | 905–1234 | 329 years | Monarchs of Navarre and Aragon |
| Bendahara | 1699–present | c. 326 years | Pahang/Malaysia sultans; estimation |
| Song | 960–1279 | 319 years | Chinese emperors |
| Romanov | 1613–1917 | 304 years | Tsars of Russia |
| Liao and Western Liao | 916–1218 | 302 years | Khitan rulers |
| Later Jin and Qing | 1616–1912 | 296 years | Jurchen/Manchu emperors of China |
| Ming and Southern Ming | 1368–1662 | 294 years | Chinese emperors |
| Babenberg | 962–1246 | 284 years | Dukes of Austria |
| Ptolemaic | 305–30 BCE | 275 years | Final (Hellenistic) dynasty of independent Egypt |
| Tang | 618–690, 705–907 | 274 years | Chinese emperors; non-continuous |
| Fatimid | 909–1171 | 262 years | Caliphs |
| Nasrid | 1230–1492 | 262 years | Emirs of Granada |
| Rajasa | 1222–1478 | 256 years | Javanese rulers |
| Thutmosid | c. 1550 – c. 1295 BCE | c. 255 years | Eighteenth Dynasty of Egyptian pharaohs |
| Dunkeld | 1034–1286 | 252 years | Kings of Scotland |
| Karaman | 1255-1501 | 246 years | Sultans of eponymous Turkish state |
| Bubastite | c. 945 – c. 715 BCE | c. 230 years | Twenty-second Dynasty of Egyptian pharaohs |
| Bubastite | c. 945 – c. 715 BCE | c. 230 years | Twenty-second Dynasty of Egyptian pharaohs |
| Achaemenid | 550–330 BCE | 220 years | Persian Empire; adjusted start |
| Bernadotte | 1818–present | 208 years | Swedish monarchs; Norwegian monarchs 1818–1905 |
There are 43 sovereign states with a monarch as head of state, of which 41 are ruled by dynasties. There are currently 26 sovereign dynasties.
Though in elected governments, rule does not pass automatically by inheritance, political power often accrues to generations of related individuals in the elected positions of republics and constitutional monarchies. Eminence, influence, tradition, genetics, and nepotism may contribute to the phenomenon.

Hereditary dictatorships are characterized by the dictator keeping political power within their family due to personal choice. The successor may be groomed during their lifetime, as was the case for Bashar al-Assad and his brother Bassel, or a member of their family may manoeuvre to take control of the dictatorship after the dictator's death, similar to the case of Ramfis Trujillo or Mojtaba Khamenei.
| Dynasty | Regime | Dynastic founder | Current leader | Year founded | Length of rule |
|---|---|---|---|---|---|
| Kim family | Kim Il Sung | Kim Jong Un | 1946 | 78 years, 278 days | |
| Gnassingbé family | Gnassingbé Eyadéma | Faure Gnassingbé | 1967 | 59 years, 213 days | |
| Bongo family | Omar Bongo | Brice Oligui Nguema | 1967 | 58 years, 350 days | |
| Nguema family | Francisco Macías Nguema | Teodoro Obiang Nguema Mbasogo | 1968 | 58 years, 32 days | |
| Gouled-Guelleh family | Hassan Gouled Aptidon | Ismaïl Omar Guelleh | 1977 | 49 years, 139 days | |
| Hun family | Hun Sen | Hun Manet | 1985 | 41 years, 303 days | |
| Khamenei family | Ali Khamenei | Mojtaba Khamenei | 1989 | 37 years, 162 days | |
| Déby family | Idriss Déby | Mahamat Déby | 1991 | 35 years, 258 days | |
| Aliyev family | Heydar Aliyev | Ilham Aliyev | 1993 | 33 years, 142 days | |
| Berdimuhamedow family | Gurbanguly Berdimuhamedow | Serdar Berdimuhamedow | 2006 | 19 years, 327 days | |
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The basic idea of monarchy was the idea that hereditary right gave the best title to political power ... The dangers of disputed succession were best avoided by hereditary succession: ruling families had a natural interest in passing on to their descendants enhanced power and prestige ... Frederick the Great of Prussia, Catherine the Great of Russia, and Maria Theresa of Austria were alike infatuated with the idea of strengthening their power, centralizing government in their own hands as against local and feudal privileges, and so acquiring more absolute authority in the state. Moreover, the very dynastic rivalries and conflicts between these eighteenth-century monarchs drove them to look for ever more efficient methods of government