Celtiberians

• 1. Introduction

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  Celtiberians once stopped an invasion that Rome itself had failed to contain. In 105 BC, Celtiberian warriors drove the Germanic Cimbri out of Spain. The clash was part of the wider Cimbrian War, fought from 113-101 BC. Strabo, along with other classical authors, described these fighters explicitly as Celts, inhabiting the central-northeastern Iberian Peninsula. Yet Rome spent decades grinding down these same tribes, forcing uprising after uprising before the region was fully absorbed. Who were the people that classical writers argued about even naming correctly? What convinced Roman soldiers to abandon their own swords for Celtiberian ones? And what finally became of a resistance so fierce it took Rome the better part of a century to end?

• 2. A Disputed Name

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  Diodorus Siculus, Appian and Martial all used the term Celtiberi, tracing it to intermarriage between Celts and Iberians after a long period of warfare. Barry Cunliffe was unconvinced, writing that this explanation "has the ring of guesswork about it." Strabo took a simpler view, treating the Celtiberians as merely a branch of the wider Celti. Pliny the Elder disagreed with all of them, arguing that the true origin of Iberia's Celts lay with the Celtici in the southwest. He based this on shared sacred rites, a common language, and matching city names.

• 3. Tongue And Territory

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  The Ebro river marks a clear boundary, separating Celtiberian lands from peoples who spoke non-Indo-European languages. Celtiberians wrote their own language by adapting the Iberian alphabet, producing what scholars call the Celtiberian script. Numerous surviving inscriptions let researchers classify Celtiberian as a Hispano-Celtic language, part of the wider Iberian Celtic family spoken across pre-Roman and early Roman Iberia. Material culture ties the Celtiberians to Celts in Central Europe, yet also shows real gaps with both the Hallstatt and La Tène cultures. Even so, classical writers and modern scholars alike have never fully agreed on where the Celtiberian world starts and ends.

  Most scholars count the Arevaci, Pellendones, Belli, Titti and Lusones as core Celtiberian tribes. Some also add the Berones, Vaccaei, Carpetani, Olcades or Lobetani to that list.

  The Celtiberian heartland sat in the northern meseta, running through the upper valleys of the Tagus and Douro to the Ebro. Today that ground falls within the Spanish provinces of Soria, Guadalajara, Zaragoza and Teruel. Greek and Roman writers who reached this territory found it ruled by a military aristocracy that had turned itself into a hereditary elite. The Arevaci dominated their neighbors from strongholds at Okilis, known today as Medinaceli, and led the long Celtiberian resistance to Rome. The Belli and Titti held the Jalón valley, while the Lusones controlled land further east.

• 4. Iron, Swords And Towns

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  Stone-walled castros appeared as early as the 6th century BC, marking a new permanence in Celtiberian settlement. Archaeologists Martín Almagro Gorbea and Alberto José Lorrio Alvarado trace developed Celtiberian culture back to these castros. They point to distinctive iron tools and an extended-family social structure they call proto-Celtic. From the 3rd century BC, the oppidum, a fortified city with its own defined territory, replaced the clan as the basic political unit. Castros survived only as smaller, subsidiary settlements within that structure. These fortified towns, which Roman historians called civitates, negotiated their own hospitality pacts, formed and broke alliances, and minted their own coinage. Even so, Celtiberian armies kept fighting along old clan lines, a structure that cost them strategic and tactical control.

  Metalwork dominates Celtiberian archaeological finds, partly because metal survives underground far better than other materials. Excavated horse trappings and prestige weapons point to a warrior culture built around martial display. The Romans adopted the Celtiberian two-edged sword outright. According to Varro, they even borrowed the word lancea, their term for a thrown spear, from a Hispanic source. One ancient writer put it directly: "The Celtiberians excel the rest of the world in the construction of their swords, for their point is strong and serviceable, they can deliver a cut with both edges." The same account adds that Rome abandoned its traditional swords after the Hannibalian War, copying the Iberian design, though "they can by no means imitate the excellence of the steel."

  Grave goods at Celtiberian cemeteries trace this shift directly. Aristocratic tombs from the 6th-5th centuries BC gradually gave way to warrior burials. From the 3rd century BC onward, weapons increasingly vanished from graves altogether. Researchers link that change to either urgent redistribution of weapons among living fighters, or to growing urbanisation. Excavations at strongholds including Kontebakom-Bel Botorrita, Sekaisa Segeda and Termantia have filled out this picture. Many late Celtiberian oppida still sit beneath modern towns, which keeps archaeologists from digging further.

• 5. Rome's Long War

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  In 195 BC, Rome conquered part of Celtiberia. The process was not complete until 72 BC, when the whole region became the province of Hispania Citerior. Celtiberian tribes rose against Roman rule again and again, in uprisings dated to 195-193 BC, 181-179 BC, 153-151 BC and 143-133 BC.

  During the Second Punic War, Celtiberians most often fought as allies or paid mercenaries of Carthage. Some crossed the Alps among the mixed forces under Hannibal's command. Scipio Africanus later turned that arrangement around, persuading many Celtiberian tribes to switch sides and fight the Carthaginian forces instead. Once Carthage's empire in Spain fell to Rome, some Celtiberian tribes challenged the power now looming on their borders.

  Tiberius Sempronius Gracchus spent 182-179 BC pacifying the Celtiberians, later boasting that he had destroyed more than 300 of their settlements.

  In 155 BC, a Lusitani raid into Hispania Ulterior defeated two Roman praetors in succession, encouraging the town of Segeda, in Hispania Citerior, to rebel. The next year Segeda refused to pay tribute or supply troops, instead forming a confederacy with neighboring towns and starting work on a defensive wall. Rome sent Quintus Fulvius Nobilior against the Celtiberians in 153 BC with close to 30,000 men. He arrived late and was ambushed soon after, losing 6,000 Romans. His follow-up siege of Numantia, where the Segedans had taken refuge, fared no better. Three war elephants brought against the walls panicked and turned on the Romans, who fled in confusion. Nobilior's men later suffered frostbite, and some died in the winter cold. His campaign cost more than 10,000 lives in total.

  In 137 BC, Celtiberian forces achieved something rarer still, forcing the surrender of a 20,000-man Roman consular army under Gaius Hostilius Mancinus. In 134 BC, the consul Scipio Aemilianus arrived in Spain to take charge of these demoralised Roman troops.

• 6. Numantia's Last Stand

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  A ditch and palisade soon encircled Numantia, backed by a wall ten feet high. Towers rose every hundred feet along that wall, each fitted with catapults and ballistae. To seal off the river, Roman engineers moored logs across the water, studded with knives and spear heads that spun in the current. Jugurtha, who would later turn against Rome himself, arrived from Numidia with twelve war elephants to reinforce the siege. Roman strength swelled to 60,000 men, spread across seven camps ringing the town.

  The Numantines, one ancient account says, were "ready though they were to die," yet "no opportunity was given them of fighting." Repeated attempts to break the encirclement were driven back, and no help arrived from neighboring towns. As hunger set in, Numantine envoys asked Scipio whether surrender would be met with moderation. They pleaded that they had fought only for their women, children and freedom. Scipio would accept nothing less than deditio, unconditional surrender. Hearing this, the Numantines, described as "wilder than ever and beside themselves by reason of their hardships," killed their own envoys.

  After eight months, starvation had reduced the population to cannibalism, and the surviving Numantines, filthy and starving, finally gave in. Even then, Appian records, "such was the love of liberty and of valour" in the town that many chose to kill themselves rather than surrender. Families poisoned themselves, weapons were burned, and the town itself was set on fire. Only about 8,000 fighting men had held Numantia when the siege began, and barely half that number lived to see its end. A pitiable few survived to walk in Scipio's triumph. The rest were sold into slavery, and the town was razed to the ground, its territory split among its neighbors.

• 7. After The Fall

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  The earliest inscribed plaque from Botorrita dates to the years right after Numantia's destruction. Later plaques from the same site were written in Latin instead. The Sertorian War, fought from 80-72 BC, brought the last formal Celtiberian resistance to Rome. Celtiberian culture was submerged into the wider Roman world that followed.

  Hundreds of place names across modern Spain still trace back to Celtiberian origins. Formal archaeological recovery of Celtiberian culture began with excavations at Numantia, published from 1914-1931. A Roman auxiliary unit named the Cohors I Celtiberorum later served in Britain, its presence confirmed by discharge diplomas dated to the 2nd century AD.

  A genetic study published in Science in March 2019 examined three Celtiberians buried at La Hoya, in Alava, between 400-195 BC. Compared with non-Celtic populations elsewhere in Iberia, they carried notably high levels of north-central European ancestry. One of the men studied was found to carry the paternal haplogroup I2a1a1a.