Hero image: AI generated illustration evoking the leprosy confusion theory of Cagot origin, a hooded figure and a generic Pyrenean village at dusk. Not a photograph, not a depiction of any real person, and not a claim that Cagots had leprosy.
In the neighborhood of Bozate, in the Baztan valley of Navarra, lives the last community in Europe that was legally treated as untouchable within its own country for close to five centuries. The Agotes, called Cagots across the border in France, could not marry outside their group, touch food in a market, or enter a church except through a separate low door. Historians have guessed at their origin since at least 1542, when the word first appears in print: Visigothic heretics, Cathar refugees, leprosy sufferers, Moorish soldiers, even shipwrecked Vikings have all been proposed. In 2026, a team publishing in the journal iScience did what a century of speculation had not: they sequenced the Agotes' genomes. The answer was not exotic. It was local.
A caste with no crime attached
Unlike most persecuted minorities in European history, the Agotes were never accused of a religion, a nationality, or a crime that explained their exclusion. They were Catholic, spoke the local language, and by every account looked like their neighbors. That did not stop centuries of restriction. They were confined to segregated quarters on the edge of towns, forbidden from most trades apart from carpentry, masonry, and woodcutting, and barred from selling food, touching livestock, or drinking from the public fountain. Inside church, a separate and deliberately low side door forced them to bow on entry, and a dedicated holy water font kept them from touching the one used by everyone else. Marriage outside the group was forbidden, which imposed the strict endogamy geneticists would later be able to measure directly in Agote DNA. Pope Leo X ordered Cagots treated with the same kindness as any other believer in 1514, an instruction local authorities mostly ignored. Legal discrimination ended with the French Revolution, but social prejudice lingered long after. As late as 2008, Marie-Pierre Manet-Beauzac was reported to be the only person in France still willing to publicly identify as a Cagot.
Five centuries, five different ancestries
Nobody agreed on where the Cagots came from, and the guessing produced a genuine catalogue of rival theories. One reading of the word itself, from Old Occitan for dog plus Goth, pointed to the Visigoths defeated by the Franks at Vouillé in the sixth century, cast afterward as a heretical remnant. A second theory linked them to Cathar heretics scattering into the Pyrenees during the thirteenth century Albigensian Crusade. A third traced the stigma to leprosy: Cagots were sometimes labeled with the same Latin term used for lepers, and even those with no symptoms were described as carriers of an invisible white leprosy. A fourth theory, championed by Marie-Pierre Manet-Beauzac herself and by earlier scholars including Pierre de Marca, proposed descent from Moorish soldiers left behind after the eighth century Muslim campaigns into Aquitaine. A fifth and more recent theory, argued at length by researcher Joel Supery in 2015, proposed that the Agotes descended from Scandinavian raiders defeated in Gascony around the year 982, pointing to their documented skill in woodworking and seafaring as circumstantial evidence. Each theory had its defenders. None had genetic data.
The first genome, 2026
That changed with a study of 125 individuals newly sampled from Bozate, the wider Baztan valley, and Navarra, analyzed using genome-wide genotype data and published in iScience. Earlier attempts to study Agote origins had relied on anthropometric and seroanthropological observation, the pre-genomic tools of an earlier era of physical anthropology; no genome-wide study had been carried out before. The results were direct. The Agotes show a local genetic origin, sitting within the broader Basque genomic landscape rather than pointing toward any external population. They carry high levels of homozygosity, the genetic signature of a population that married within itself for many generations, consistent with centuries of enforced endogamy rather than deliberate cultural choice. The study's authors describe the isolation as most plausibly a socio-cultural outcome, the direct genetic consequence of the marriage ban rather than of an outside origin. At a finer scale, the data reveal distinct Agote and Baztan genetic microstructures nested inside the wider Basque population, a level of local detail that a population of shared, external ancestry would not produce.
Distance from a northwest Navarre Basque proxy for the Baztan valley to the populations invoked by each origin theory, plus a direct Bearn to Haute-Garonne distance as a regional baseline.
What the proxy comparison shows
No Agote-specific Global25 coordinates exist publicly, so this is not a direct test of Agote DNA. It tests the surrounding population landscape the origin myths depend on, using the nearest available modern proxy for the Baztan valley: Basque populations of northwest Navarre. That proxy sits at a distance of only 8.9 from both the general Basque population of Spain and the Basque population of French Lower Navarre just across the border, and no more than 16.9 from Bearn, the French region on the other side of the same mountains where Cagots also lived. Every population invoked by an origin myth sits much further away. Spanish Cantabria, a non-Basque neighboring region, sits at 32.6. The Haute-Garonne area around Toulouse, the historical heartland of Catharism, sits at 39.1, farther from the Baztan proxy than Cantabria despite being the specific region the Cathar theory names. A Visigothic period ancient sample from Catalonia sits at 53.0, roughly six times further than the nearest Basque neighbor. A modern Scandinavian consensus, averaged from Norwegian and Swedish data, sits at 90.2, ten times further than the nearest neighbor and further than any other point on this chart. For scale, Bearn and Haute-Garonne sit only 30.1 apart from each other, meaning two regions within the same country are closer to one another than either is to the population the Cathar and Visigothic theories would need the Agotes to resemble.
What this method cannot say
Four limits, stated plainly. This is not a reconstruction of Agote ancestry itself, since no Global25 coordinates for the sampled individuals have been published; it tests the population landscape the historical theories depend on, not the Agotes' own genomes. The 2026 iScience study used its own genome-wide dataset and its own statistical methods, not Global25 or NNLS, so the numbers above are an independent illustration and not a reproduction of that paper's figures. Modern regional populations carry five more centuries of demographic history than the Cagots who lived under formal restriction, so a short or long distance today is suggestive, not definitive, about the medieval period. And both the Visigothic ancient sample, with only six individuals, and the Scandinavian consensus, averaged from two modern populations rather than Viking Age ancients, are small or approximate reference points that a larger dataset could shift.
Myth and measurement
| The theory | What the evidence shows |
|---|---|
| The Agotes descended from Visigothic heretics, hence the word cagot, dog Goth. | The 2026 genome-wide study finds a local genetic origin within the Basque landscape. The available Visigothic period sample from Iberia sits far from the Baztan valley proxy, and the canis Gothus etymology itself is disputed since the word cagot first appears only in 1542. |
| The Agotes were Cathar refugees who fled the thirteenth century Albigensian Crusade into the Pyrenees. | The historical Cathar heartland around Toulouse sits farther from the Baztan proxy than even a non-Basque neighboring Spanish region, Cantabria. The 2026 study places the Agotes inside the local Basque genomic landscape rather than tracing them to Languedoc. |
| The Agotes were descendants of medieval lepers, hence centuries of exclusion from churches, markets, and fountains. | Historians trace this belief to a term shared between Cagots and lepers in some regions, which produced the idea of an invisible white leprosy even among Cagots who showed no symptoms. It explains the shape of the persecution, not a shared ancestry. |
| The Agotes descended from Moorish soldiers left behind after eighth century campaigns into Aquitaine. | This theory is still defended today by Marie-Pierre Manet-Beauzac, the last person publicly identifying as a Cagot. The 2026 genome-wide results instead place the Agotes within the local Basque population rather than pointing toward a North African or Middle Eastern source. |
| The Agotes descended from Scandinavian raiders defeated in Gascony around the year 982. | Of every population tested here, a modern Scandinavian consensus sits the farthest from the Baztan valley proxy, roughly ten times more distant than the nearest Basque neighbor. |
References
- iScience 2026 Genome-wide evidence for the local ancestry of the Agotes from Navarra, Spain. iScience, 2026. Read the paper
- Supery 2015 Supery J. Agots of Gascony and Navarra, outcasts of Scandinavian origin. Academia.edu, 2015. Read the paper
- The National 2008 Meet Marie-Pierre, she claims to be from one of history's most persecuted peoples, the Moors. The National, July 21, 2008. Read the article
- Arthinkal The Cagots of France. Arthinkal Magazine. Read the article
- Note Global25 coordinates for the Agotes themselves have not been published. The population distances above use the nearest available modern Basque proxy for the Baztan valley and the modern or ancient populations named by each origin theory, computed independently of the iScience study's own genome-wide analysis.
The coordinates
Global25 scaled coordinates for the Basque Navarre proxy and the comparison populations used above, for anyone who wants to reproduce this comparison in Vahaduo.
Basque_Spain_Navarre_Northwest,0.12955136,0.14974436,0.056465455,0.010541545,0.057577091,0.00060845455,-0.00061954545,0.0020768182,0.030213636,0.044830091,-0.0060673636,0.012084818,-0.024326273,-0.019242091,0.014151727,0.0025795455,-0.0034966364,0.0037661818,-0.002057,-0.00274,0.010050455,0.002192,-0.0093444545,-0.010921455,0.0025473636
Basque_France_Lower_Navarre,0.12965473,0.14826718,0.055539636,0.011040727,0.055030909,0.0014451818,-0.0011536364,0.0010908182,0.030399727,0.044250091,-0.005034,0.011716818,-0.022758545,-0.016026636,0.017224091,-0.000096454545,-0.0076688182,0.0026373636,-0.002434,-0.0018646364,0.0064885455,0.0024506364,-0.0078540909,-0.0095960909,0.002863
Basque_Spain,0.12547856,0.1489578,0.05441092,0.00854012,0.05412692,0.00059132,-0.0006298,0.00081216,0.02897684,0.0417466,-0.00528736,0.01038276,-0.0249632,-0.0186396,0.0152658,0.0019464,-0.00584644,0.00297968,-0.00213696,-0.00316148,0.00836528,0.00164704,-0.00701032,-0.00850236,0.00085736
Basque_France,0.12970887,0.15126965,0.054485696,0.011305,0.056157565,0.0012367826,-0.0011341304,0.0026787391,0.028953565,0.041129913,-0.0080276087,0.011370261,-0.021859565,-0.015276087,0.013902435,-0.00083017391,-0.0098355652,0.0028972609,0.00040447826,-0.004996913,0.0089353043,0.0036021304,-0.0079628696,-0.008047087,0.0011089565
French_Occitan_Bearn,0.1267991,0.1448145,0.0535889,0.0060078,0.0539486,0.0021754,-0.001692,-0.0020537,0.024461,0.0398913,-0.0088665,0.0102359,-0.0189989,-0.0143265,0.0141693,0.001578,-0.0057238,-0.0008996,-0.0017346,-0.0033017,0.0054653,0.0031407,-0.0066429,-0.0081696,0.0006825
Spanish_Cantabria,0.11556827,0.14603313,0.0441734,0.00034453333,0.0466958,-0.0035326667,-0.0010026667,0.0019384667,0.0256064,0.032936133,-0.0047525333,0.0082926667,-0.015906667,-0.0145696,0.010124733,-0.00019453333,-0.0026162667,-0.00089526667,-0.0033769333,-0.0036267333,0.0030446,-0.0021351333,-0.0049380667,-0.0040728,-0.00067066667
French_Occitan_Haute_Garonne,0.12702032,0.144864,0.048913514,0.017459459,0.043542378,0.0035728378,0.00040013514,0.0038605946,0.014952351,0.023725135,-0.0032608649,0.0066588378,-0.01501873,-0.0094774324,0.010597189,0.0025873243,-0.0035698108,0.0023420811,0.0012910541,-0.000081027027,0.0035747297,0.0024195946,-0.0025548108,0.0017520541,0.00048221622
Spain_Catalonia_Early_Medieval_Visigoth,0.12729233,0.13557333,0.048397167,0.020672,0.0400585,0.0050201667,0.0046608333,0.001923,0.0095103333,0.016613667,-0.0068473333,0.0043983333,-0.0129085,-0.00578,0.0053835,0.0051268333,0.0057803333,0.0034418333,-0.0012568333,0.0038976667,0.0069668333,0.0033798333,-0.0022595,0.0033338333,-0.0006585
Scandinavian_consensus_modern,0.132222,0.127265,0.0704107,0.0571112,0.0403497,0.0203045,0.00558162,0.00784257,0.00453017,-0.00476292,-0.00426924,0.00226618,-0.00598775,-0.00689897,0.0172671,0.0067652,-0.00572497,0.00263305,0.00300517,0.00540472,0.00651245,0.00288673,0.000858937,0.0124871,-0.000224851