The institutions of the French Basque Country before 1789 were largely based — in this territory, which today forms part of the French department of Pyrénées-Atlantiques and borders on Spain — on a social structure built around the Basque house (etxe), and its intergenerational transmission, as well as the management of common lands. This translates into the shared enjoyment of an undivided property. This joint management by the Basques is considered to be at the origin of the parish assemblies, which form the basis of the deliberative institutions of the Basque Country.

During the 1st millennium CE, under Roman influence, the region now encompassing Labourd, Lower Navarre, and Soule underwent its initial organizational evolution toward greater democracy. Through the feudal era, these provinces experienced varying fortunes, influenced by Navarrese, French, or English dynasties. Despite efforts to impose centralized or elitist authority, a significant social leveling emerged. Territorial management practices, such as Soule's kayolars, which persist today, originated during this time.

Each of these provinces enjoyed, during the Ancien Régime, an administrative, political, and financial system that gave significant importance to parish assemblies. The most unique of these assemblies, due to the exclusion of the nobility and clergy from decision-making bodies, was the of Labourd, in comparison to the Souletin Cour d'ordre and the General Estates of Lower Navarre. The institutions of the three provinces managed, to varying degrees, to preserve part of their privileges until the Revolution; these privileges were regularly renewed through royal letters patent from various suzerains to account for the region's economic poverty, the military devastation caused by repeated Spanish incursions, the maintenance of a significant local militia, and the demonstrated loyalty of the civilian populations to the reigning Crown through their armed mobilization in defense of the borders. Until the end, Lower Navarre maintained and defended a special status as a frontier kingdom, which was acknowledged at the beginning of each new reign by a respectful and protective oath from the new French suzerain.

Despite strong opposition, unanimously shared by the — the nobility, the clergy, and the commoners — the local institutions of the three provinces were definitively replaced by the rules established by the night of August 4, 1789. The abolition of privileges and the establishment of the department of Basses-Pyrénées, which included Béarn, Soule, Lower Navarre, Labourd, and Bayonne, brought an end to the institutional peculiarities and local privileges that had endured for nearly eighteen centuries.

Preliminary clarification As a historical region, the French Basque Country saw its borders evolve significantly before and during the Ancien Régime. For example, while the integration of Lower Navarre into French territory is discussed later in the article, the particular situation of the territories located north of the current department of Pyrénées-Atlantiques during the two centuries preceding the Revolution is not addressed in the following sections.

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Social foundations Although the French Basque Country has a rich history, often closely intertwined with that of Aquitaine and even France, its collective ways of life constitute a uniqueness that clearly distinguishes it. In the Basque Country, the house (la maison) held, until the Revolution, a familial and legal status that had significant consequences on rural society's economic and political organization.

It emerges from Maïté Lafourcade's presentation that traditional Basque society is based on two pillars: one being the house, complemented by its mode of intergenerational transmission, and the other the communal enjoyment of an indivisible property. The family property is represented by its owner, the etcheko-jaun, or rather its manager. The individual is dominated by the house, to the point of taking its name. The poverty of the land means that it is not enough to sustain a family, and extensive farming is essential, as are the common lands, managed equally by the heads of households. This community also serves to pay off debts or fulfill obligations through labor. This communal management between equals is the origin of the parish assemblies, which have financial, administrative, or political powers in the three Basque provinces of France.

From Antiquity to the Middle Ages

The Gallo-Roman period and the Early Middle Ages

The Tarbelles, a proto-Basque Aquitanian people, occupied a territory in the 1st century BC that stretches from the south of the Landes to the present-day French Basque Country, from Chalosse to the valleys of the Adour, and from the rivers of Pau and Oloron. This civitas, established by Augustus between 16 and 13 BC, was divided into pagi, territorial and legal districts, each with a capital. The Suburates, settled in the Saison valley of present-day Soule, seem to have occupied one of these districts, and Hasparren and Bayonne were probably the capitals of such districts.

In the 1st century AD, Rome replaced the traditional Gallic vergobret, the sole executive leader, with a collegiate system, according to the authors. As a result, a municipal senate elected annually a council that governed the civitas, composed of two duumvirs who held a preeminent role, along with two édiles and a quaestor. The municipal senate was the deliberative body; it could have up to one hundred members, chosen for their merit or wealth. Within the Aquitanian pagi, local notables elected two or four magistri, who were bound by the decrees of the senate. The armed forces and criminal justice were under the authority of the governor of Aquitaine, while the duumvirs were responsible for civil law matters.

In the Late Empire, centralization undermined administrative organization: the emperor selected the curator who governed the city, relying on a network of and lucrative positions, also known as prébendes. In 364 AD, Valentinian I, to restore a more favorable balance for his subjects, established a protective role of defender of the city, often held by the bishop. The Pierre d'Hasparren, discovered in 1660 and composed of five dactylic hexameters without elisions, which likely adorned the façade of a votive altar, serves as a testament to these changes:

In 587, the date of the signing of the Treaty of Andelot, Lapurdum governed an enclave that included Labourd, and probably also the valleys of Baïgorry, Cize, Ossès, and , though the institutions of this region are unknown. This situation lasted until the Norman invasions—one of which is doubtful in 844, and a second, confirmed, in 892—and during the century and a half that followed.

Feudalism The feudal era saw the emergence in Aquitaine, as in the rest of France, of states of various sizes, characterized by significant autonomy. The three Basque provinces of France underwent an evolution during the Middle Ages, influenced by the conflicts and ambitions of the kingdoms of Navarre, England, and France.

Labourd In Labourd, the viscounty, seemingly created by Sancho III of Navarre, known as "the Great," between 1021 and 1023, holds direct administrative and judicial powers, while its subjects are consulted on certain matters. Briefly, the viscount possesses the highest ownership over the lands of the viscounty, as well as over inhabited places. Soon, private estates of varying sizes develop, while the viscount retains certain monopolies, such as those of hunting and milling. However, these privileges are short-lived, as he sells the milling monopoly to the people of Labourd in 1106.

Bayonne came under English domination when the Duchess of Aquitaine (Eleanor) married the King of England in 1152. In 1177, Richard the Lionheart separated the city from the viscounty of Labourd, making Ustaritz the new capital. Like many towns of the time, Bayonne was granted a municipal charter in 1215 and freed itself from feudal powers. In 1311, the land of the viscounty still belonged to the King of England—Edward II in this case—who received rents from it. The crown still held part of the vacant lands that had not been acquired in 1106, but the village communities had the right to use these lands. While lower justice was under the jurisdiction of the sixty nobles' houses of the viscounty, high justice remained under the authority of the king. From this time, the two core elements of feudalism—the property and the lordly authority—appear to have been significantly weakened in Labourd. The inquiry ordered in 1311 by Edward II revealed that "...the entire land of Labourd is held immediately from our lord the King of England and Duke of Aquitaine by the nobles and inhabitants of the said land..." The term "noble" here refers to the owners of noble houses, which is distinct from the use of "gentleman" at court. This is why Maïté Lafourcade describes Labourd during this period as a "collective vassal of the King of England."

Lower Navarre At the turn of the 2nd millennium, Sancho the Great ruled over Navarre, Castile, part of León, Upper Aragon, the Pyrenean valleys, and all of Gascony. Upon the death of Sancho the Strong on April 7, 1234, Navarre passed to the Counts of Champagne, then to the Kings of France—successively Philip the Fair, Louis the Quarreller, Philip the Long, and Charles the Bald—from 1274 to 1328, and finally to the houses of Évreux-Navarre from 1328 to 1425, then to Albret from 1425 to 1512, when the Kingdom of Navarre was invaded by Ferdinand the Catholic. Sancho the Great had made Labourd a viscounty, and Sancho William, in turn, gave Soule to Viscount William Fort I in 1023. Lower Navarre was solely part of the Kingdom of Navarre—represented in Saint-Jean-Pied-de-Port since at least 1194 by a châtelain. It became definitively part of Navarre in the 13th century, as a result of the conflict between 1244 and 1245 between the Kings of England (Henry III) and Navarre (Theobald I). In 1449, Gaston IV of Foix-Béarn seized , the capital of Soule, on behalf of King Charles VII of France. While on March 18, 1451, the people of Labourd submitted to the authority of the French king—while retaining their freedoms—on August 20 of the same year, Bayonne returned to the Kingdom of France. Only Lower Navarre was not part of it.

Lower Navarre, a collection of "lands" and valleys under the rule of the King of Navarre, is a territory of freehold, which contrasts with fiefs or , and is therefore not subject to any feudal dues, except for the rights of certain landowners. The land is under the sovereignty of the king, who, owns only a few domain lands in the province. Aside from a few local seigneuries and the lower justice held by several houses over certain fivatiers,The so-called fivatières houses depended on another house, noble or free. justice is administered by royal officers. The highest of these is the châtelain of Saint-Jean-Pied-de-Port for all the tierras de aillent-puertos (another name for tierras de ultra-puertos), who holds administrative, fiscal, and military powers. Outside the châtellenie, the king is also represented by the alcaldes of Cize and Arberoue, the bailes of Mixe and Ostabaret, and the merin of Ossès. In general, therefore, and aside from the previously mentioned seigneuries, Lower Navarre at the end of the Middle Ages was not a land of feudalism.

Lower Navarre had two centers that minted currency: one in Saint-Jean-Pied-de-Port, which disappeared quickly but seems to have still been active in 1385, and the other in Saint-Palais, established in 1351 and operating until 1634.