France has several dozen sovereigns spread over more than a millennium, from the Merovingians to the Bourbons. Tracing the genealogy of the kings of France means following a dynastic thread that cannot be reduced to a father-son succession. Extinctions of lineages, cadet branches propelled to the throne, repeated consanguineous marriages: the royal family tree resembles more of a network than a straight line.
The Salic Law, the cornerstone of French royal succession
No family tree of the kings of France can be understood without the Salic law. This legal principle, invoked from the 14th century, excludes women from the succession to the throne. It has shaped the entire dynastic logic of the kingdom.
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When the three sons of Philip IV the Fair die without a direct male heir, the crown passes to Philip VI of Valois, a cousin from the cadet branch. This shift in 1328 triggers a legitimacy conflict with England, whose King Edward III claims the throne through his mother. The Hundred Years’ War directly results from this.
The Salic law is not a fixed text. It has been reinterpreted according to the political needs of each era. Under the early Capetians, the question did not arise: the kings had sons. It is the biological extinction of direct lineages that transformed a usage into a constitutional rule. Studying the genealogy of the kings of France requires measuring how much this principle has guided marital alliances for centuries.
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Dynastic changes: when the family tree breaks and recomposes
The history of France knows four great royal dynasties: Merovingians, Carolingians, Capetians (with the Valois and Bourbon branches). Each transition corresponds to a genealogical break, sometimes abrupt, sometimes prepared over several generations.
From Merovingians to Carolingians
The last Merovingians, labeled “lazy kings” by Carolingian chroniclers, gradually lose real power to the mayors of the palace. Pepin the Short deposes the last Merovingian in 751 with the support of the pope, founding a new legitimacy that is both military and religious.
This precedent is crucial. It shows that genealogy alone is not enough to maintain a dynasty in power. Royal blood must be accompanied by the ability to govern, or at least by sufficient institutional support.
The rise of the Capetians
In 987, Hugh Capet ascends to the throne while the Carolingian lineage is not completely extinguished. Descendants of Charlemagne still exist, notably Duke Charles of Lower Lorraine. The election of Hugh Capet is as much a political choice as it is a dynastic one.
The early Capetians consolidate their position through a remarkable strategy: associating the throne with the eldest son during the father’s lifetime. This practice, maintained over several generations, transforms an elective monarchy into a de facto hereditary monarchy.
Valois and Bourbons, two branches of the same trunk
The Valois come to power in 1328 through the mechanism described above. The Bourbons succeed them in 1589, when Henry IV, a descendant of Robert of Clermont (the sixth son of Louis IX), inherits the throne after the assassination of Henry III. Henry IV is over twenty generations removed from the common ancestor, illustrating the depth of the Capetian branches.
Royal marriages and consanguinity: the biological constraints of lineage
French sovereigns almost exclusively marry within a narrow circle of European ruling families. This choice, dictated by diplomacy and the preservation of rank, produces a predictable genealogical effect: the same ancestors reappear multiple times in the tree.
Louis XIV marries Maria Theresa of Austria, his double first cousin. Their common ancestors include Philip the Handsome and Joanna of Castile. This type of union, common in the 17th century, is not without consequence. Of the couple’s six children, only one reaches adulthood.
Infant mortality in royal families, often attributed to the sanitary conditions of the time, also raises questions from a genetic perspective. The available data does not allow for a definitive conclusion about the respective roles of consanguinity and epidemics, but the phenomenon is documented in several European ruling houses of the same period.
- The Spanish Habsburgs, frequent allies of the Bourbons, present an extreme case of dynastic consanguinity that led to the extinction of their branch in 1700.
- Marriages between uncle and niece or between first cousins remain practiced until the 18th century, requiring systematic papal dispensations.
- Some unions are annulled for consanguinity when they no longer serve political interests, such as that of Louis XII and Joan of France in 1498.
Royal genealogy and contemporary recoveries
The family tree of the kings of France is not confined to history textbooks. Content creators on TikTok and Instagram offer tutorials to trace one’s own lineage back to the Carolingians, including female branches and secondary houses like that of Vermandois.
The democratization of online genealogy tools (collaborative platforms, digitized archives) fuels this enthusiasm. Tracing back far enough in time allows, statistically, to intersect branches linked to ruling dynasties. This mathematical observation does not imply a direct legal lineage.
This popularity also raises questions. Dynastic genealogy is sometimes instrumentalized in identity or political discourses, a phenomenon that mainstream content (quizzes, documentaries, children’s books) generally does not address. Claimants to the throne of France, whether Orleanists or legitimists, continue to rely on genealogical arguments to support their claims.
The study of French royal lineage remains an active field of historical research. The archives digitized by departments and the National Archives offer unprecedented access to the documents that record these lineages. What is changing is less the material than the number of people interested in it and the uses they make of it.