La Única, Pamplona’s oldest peña, has always been dated to 1903. It celebrated a widely covered centenary in 2004. In February 2025, its own members published the results of a decade of archival research, conducted with the history department at the Universidad Pública de Navarra, and the conclusion was blunt: La Única was not founded in 1903. It was founded sometime between 1930 and 1933, roughly three decades later than the number every guidebook and plaque repeats.
This matters beyond one club’s birthday. The peñas of San Fermín in Pamplona are treated, almost everywhere they’re described for outside visitors, as a fixed, settled institution: a round number of social clubs, founded across the 20th century, that wear matching outfits and play brass instruments in the street. That framing is close enough to be useful and specific enough to be wrong. The actual number of peñas depends on which question you’re answering. The oldest peña’s own founding story just had to be rewritten by the people who belong to it. Getting these details right is the difference between understanding what a peña is and repeating a postcard description of one.
This account draws on the Ayuntamiento de Pamplona’s own published materials, the Diario de Noticias de Navarra’s reporting on the La Única investigation, and cross-checked histories of each individual peña, rather than a single retelling passed down from one travel guide to the next.
What a Peña Actually Is
A peña is a membership society based in Pamplona’s Casco Viejo, organized specifically to fund, animate, and take part in the Sanfermines festivities, though nearly all of them run activities the rest of the year too: football and pelota leagues, mountain excursions, cooking classes, charity drives. Members pay dues. Most peñas have existed for decades, some for the better part of a century, and belonging to one is closer to belonging to a fraternal club than to a bar’s regular crowd. Bilbao has a rough equivalent in its own festival clubs, the konpartsak of Aste Nagusia, though the two cities built and govern them along very different lines.
Every peña keeps a local, a clubhouse, almost always somewhere in the Old Town, though a few also keep a second clubhouse in the neighborhood where the peña originally formed. During the fiesta, each peña carries its own pancarta, a banner repainted every single year with a new image, usually a satirical or critical take on the year’s news, politics, or local controversies. The pancarta is not decoration. It is closer to an annual editorial cartoon that the whole city can see.
Most peñas also wear a blusón, a smock or jacket worn over the standard white Sanfermines outfit, in a check pattern or solid color specific to that peña. A few peñas, including El Bullicio Pamplonés and Armonía Txantreana, dress in plain white with no blusón at all and are identified only by the shield embroidered on their pañuelo. Each peña maintains its own brass band, or txaranga, and the specific combination of blusón pattern, pañuelo embroidery, and band sound is how longtime pamplonicas tell one peña’s presence in the street from another’s without needing to read a banner. For a fuller breakdown of terms like these, the Encierro glossary of running of the bulls vocabulary covers the full festival lexicon in one place.
The Federación’s Sixteen, and the One That Refuses to Join
The Federación de Peñas de Pamplona currently has sixteen member peñas. It was formally established in the spring of 1998, under new Spanish legislation governing associations, continuing work that had been done since 1959 by an earlier body, the Comisión de Peñas, which coordinated shared concerns between the peñas and the city council: dawn serenades, encierro logistics, participation in the July 7 procession, and funding for the txarangas.
Its newest member is El Charco, and it is the only Federación peña that did not originate in Pamplona itself. El Charco began on December 24, 2018, when a group of friends in the neighboring municipality of Ansoáin decided, after a long lunch, to found a peña. It adopted formal statutes in November 2019, made its first public appearance as a peña on July 7, 2020, and grew from ten founding members to roughly eighty within its first year. Ansoáin is physically surrounded by Pamplona but remains its own independent municipality, which is why El Charco keeps a clubhouse on Calle Jarauta specifically to stay close to the fiesta while its roots remain in Ansoáin.
Then there is Peña Mutilzarra, founded in August 1992, and by its own account and the Federación’s own bylaws, it is the only peña of San Fermín that does not belong to the Federación de Peñas de Pamplona. Mutilzarra’s defining public role is convening the popular, independent version of the Riau-Riau, the traditional procession march that peñas and crowds historically used to slow down as a form of good-natured civic protest. Mutilzarra has run this on its own for years, without the Federación’s backing and without wanting it.
Add Mutilzarra to the Federación’s sixteen and you get seventeen, the number that careful sources converge on for peñas of San Fermín overall. Guides that say “sixteen” are almost always counting Federación membership only. Guides that say “seventeen” are counting every recognized peña, Mutilzarra included. Both numbers are correct. Almost nothing written for outside visitors explains that they’re two different answers to two different questions.
The Ten-Year Investigation That Rewrote La Única’s Own History
La Única is, and remains, Pamplona’s oldest peña. What changed in February 2025 is exactly how old.
For decades, 1903 was treated as settled fact, solid enough that the peña held a major centenary celebration in 2004. Then a group of La Única’s own members, working alongside Dr. Gemma Piérola of the Universidad Pública de Navarra’s history department, spent close to a decade combing the Archivo Municipal de Pamplona, the Archivo General, newspaper archives, and private family collections belonging to members and former members. Their conclusion, presented publicly in February 2025: La Única’s real founding falls between 1930 and 1933.
The evidence is specific. The peña’s original home was the Salón Venecia in the riverside Curtidores neighborhood, before it moved to Descalzos and then, five years later, to Calle Jarauta, where most peñas still keep their headquarters today. A dated 1932 invoice from a haberdashery on Calle Pozoblanco records the purchase of the small check fabric still used for La Única’s blusón, physical documentation that anchors the founding period directly. After the Spanish Civil War, the peña relocated again to Calle Amaya 20, recording 104 members by around 1941, and for a stretch between 1953 and 1969 it operated under two interchangeable names, “La Única” and “La Única de Amaya,” with the latter serving as its formal registered name specifically from 1962 to 1969.
Some of the most striking findings involve who belonged to the peña and when. Women were not admitted as formal members until 1979 and 1980, but women had already been active in La Única’s mountain and charity sections since the 1960s, and a document from 1969 specifically authorized women in those sections to use the clubhouse, a detail the researchers said they had not previously known existed. That timeline was not universal across the city’s clubs; Muthiko Alaiak admitted women with full voting rights from its founding in 1931. Peña Irrintzi, founded in 1951, did not admit women until a 1992 vote that also rewrote its statutes. Peña La Jarana carries a wrinkle of its own: the club lists 1940 as its founding year, but the government permit that made it official used the word for resume rather than found, evidence the group survived the Spanish Civil War rather than starting fresh. Several members were executed under the Franco regime, including Jesús Dorronsoro and Calixto Aniceto Pajares. In an ironic twist, Franco-era police surveillance of the peña’s meetings, meant to monitor and control it, ended up leaving behind some of the clearest documentary evidence of what the club was actually doing decade by decade.
As the project’s coordinator, Jabiertxo Andiarena, put it when the findings were presented: the peña is still the oldest in Pamplona, just with fewer wrinkles than everyone assumed.
What Peñas Actually Do During the Nine Days
Peñas are the reason San Fermín sounds the way it sounds. Each morning before the encierro, peña bands lead the diana, the wake-up march that moves through the streets rousing the city before the bulls run. Many members stay on afterward for the recortes and vaquillas in the bullring, the last piece of the morning before the streets fill for almuerzo. Throughout the day, peña txarangas play in the plazas and bars, and peñas parade through the Casco Viejo in kalejira processions, music and dancing moving as a unit through the old streets. Peña txarangas play modern brass instruments rather than older Basque folk instruments like the alboka, the traditional double-piped horn with its own separate history and near-extinction story. Peña Mutilzarra’s independent Riau-Riau remains one of the more contested and closely watched traditions of the festival’s opening days, precisely because it operates outside the Federación’s coordination.
Away from the street, peñas run communal meals, cena de peña and comida de peña, at their clubhouses across the nine days, and several sponsor or staff txosnas, the outdoor bar stalls that operate in the Ciudadela festival grounds. Peñas are also behind one of fiesta’s most visible sights: the three-gallon jugs of kalimotxo hauled through the streets and shared out at the clubhouse. None of this stops when the fiesta ends. Alegría de Iruña has run a charity potato drive, “Operación Patata,” since 1960. Multiple peñas field football and pelota teams, organize mountain excursions, and teach Basque language classes through the rest of the year. A peña membership is a year-round commitment that simply becomes most visible for nine days in July.
How a Visitor Actually Encounters Peña Culture
Peñas are membership organizations, not public bars, and most clubhouses are closed to anyone who isn’t a member or a member’s guest. For a visitor, peña culture is mostly something you witness rather than join directly: the dianas passing at dawn, the pancartas hung above the crowd, the txarangas playing late into the night, the kalejira processions moving through the old town. During festival hours, peña-run txosnas in the Ciudadela grounds are open to the public and are one of the few points where a visitor can experience peña hospitality directly rather than from the sidewalk. Families with children have one more entry point: several peñas run their own txiki versions that parade alongside the adult clubs, a lower-key way to see peña culture up close; it is one part of a wider slate of San Fermin programming built for children, covered in this guide to Encierro Txiki and family activities.
Frequently Asked Questions
How many peñas are there in San Fermín?
It depends on what’s being counted. The Federación de Peñas de Pamplona has sixteen member peñas. A seventeenth, Peña Mutilzarra, exists and actively participates in San Fermín but does not belong to the Federación, by its own bylaws. Most complete counts of “peñas of San Fermín” cite seventeen for this reason.
What is the oldest peña in Pamplona?
La Única, founded sometime between 1930 and 1933 according to a 2025 archival investigation by the peña’s own members with the Universidad Pública de Navarra. For decades the founding date was given as 1903, and the peña marked a centenary in 2004, but that date has since been shown to be incorrect by close to thirty years.
Can a visitor join or visit a peña’s clubhouse?
Not generally. Peña clubhouses are private membership spaces reserved for members and their guests. Visitors experience peña culture in the street: the morning dianas, the txarangas, the kalejira processions, and the pancartas. Peña-run txosnas in the Ciudadela festival grounds during Sanfermines are open to the public and are the most direct way to encounter peña hospitality without membership.
Is Peña Mutilzarra part of the Federación de Peñas?
No. Peña Mutilzarra is, by its own bylaws and independent confirmation, the only peña of San Fermín that is not a member of the Federación de Peñas de Pamplona. It organizes the popular, independent Riau-Riau procession on its own each year.
Every article on the Encierro blog is authored or reviewed by active bull runners with direct experience in Pamplona.