The Celts (800BC-60AD)

From around 800 BC, communities in the northern Alps centered on Hallstatt in Austria developed one of early Europe's most distinctive Iron Age cultures. The site's salt mines generated wealth that appears in richly furnished princely burials, such as the wagon graves of southern Germany, alongside imported Mediterranean goods that testify to long-distance trade. Archaeologists link the Hallstatt culture to the spread of early Celtic speech, though the exact relationship between the culture and the language is debated by scholars. The traditional "Celtic from the East" model traces proto-Celtic to the late Bronze Age Urnfield culture that preceded it. Hallstatt elites built networks reaching from the Atlantic to the Adriatic, laying the social groundwork for the later Celtic expansion.

Location: Hallstatt, Austria

Around 450 BC a new archaeological style appeared at La Tène, a site on Lake Neuchâtel in Switzerland, and spread across a wide belt of temperate Europe from Iberia to Bohemia. Its curving, swirling metalwork, seen in weapons, chariot fittings, and ceremonial helmets such as the Agris Helmet, became the defining artistic signature of Iron Age Celtic Europe. La Tène communities organized around fortified hillforts and elite warrior households, and their burial customs, coinage, and artistic motifs mark a clear break from Hallstatt traditions. Historians treat the spread of La Tène material culture as the clearest archaeological trace of the expanding Celtic world. The style persisted in variant regional forms even after Roman conquest reshaped the continent.

Location: Lake Neuchâtel, Switzerland

In 390 BC, by the traditional Roman dating, a migrating war band of Gauls led by Brennus crushed a Roman army at the Battle of the Allia River and entered Rome itself. Livy's account records the Romans retreating to the Capitoline citadel and famously paying a ransom in gold after a dispute over weights, with Brennus' cry "Woe to the vanquished" entering legend. The sack shocked the young city into a lasting military response: Rome rebuilt behind the Servian Walls and reorganized its defenses with the memory of the Gallic catastrophe at the center of its civic identity. Modern historians treat some details of Livy's narrative as literary embellishment, but the event itself is anchored in Roman tradition and archaeology. It stands as the moment Celtic armies first demonstrated they could strike at the heart of Italy.

Location: Rome, Italy

In 278 BC three Celtic tribes crossed from the Balkans into Asia Minor after years of raiding Greece and Macedonia, settling the central Anatolian plateau that came to be known as Galatia. The Galatians, divided among the Tectosages, Tolistobogii, and Trocmi, carved out a territory around Ancyra, modern Ankara, and raided their neighbors for decades. Their arrival extended the Celtic world more than two thousand kilometers east of its European heartland and made them a factor in the wars of the Hellenistic kings. They were defeated by Antiochus I around 275 BC and later by Rome in 189 BC, but the communities survived and eventually became a Roman province in 25 BC. The New Testament Epistle to the Galatians, addressed to churches in their territory, records how long their identity endured.

Location: Central Anatolia, Turkey

In 225 BC a large migrating army of Gauls from the Po Valley and beyond pushed south into Etruria, hoping to seize Italian land as earlier Celtic bands had done. A Roman consular army intercepted them near Telamon in coastal Tuscany, and a second Roman force under Gaius Atilius Regulus arrived from the rear, trapping the Gauls between two armies. Polybius, who describes the battle in detail, reports tens of thousands of Gauls killed or captured and their leader Concolitanus taken prisoner. The victory broke the pattern of periodic Gallic incursions into Italy and gave Rome secure control of the Po Valley frontier. Historians mark Telamon as the turning point after which the Gallic threat to peninsular Italy effectively ended.

Location: Tuscany, Italy

The Celtiberian Wars between Rome and the Celtic-speaking peoples of central Spain ran intermittently from 154 BC until 133 BC and ended with the destruction of the hilltop city of Numantia. After years of Roman setbacks against their guerrilla defense, Scipio Aemilianus, the conqueror of Carthage, was sent to Spain, where he besieged the city with a large army and systematically starved it into submission. Ancient sources report that many Numantines destroyed themselves and their property rather than surrender, and the city was razed. The fall of Numantia broke the last major organized resistance of the Celtiberians and completed Rome's consolidation of most of Iberia. The siege became a Spanish national symbol centuries later, celebrated in Cervantes' tragedy about its defenders.

Location: Numantia, Spain

In 58 BC Julius Caesar, as proconsul of Cisalpine and Transalpine Gaul, intervened against the migrating Helvetii and the Germanic leader Ariovistus, beginning eight years of campaigning that would absorb the whole of Gaul into the Roman Empire. He justified each intervention to the Senate in his own Commentaries, a text that is both a military record and a piece of political self-defense. Caesar exploited rivalries between Gallic tribes, fielding allied Gallic cavalry and auxiliaries even as he subdued their kinsmen. His campaigns moved through Brittany, the Rhine crossings, and the expeditions to Britain in 55 and 54 BC. The conquest, formally completed in 50 BC, ended Gallic political independence on the continent and became the foundation of Caesar's personal power in Rome.

Location: Gaul (France, Belgium, Switzerland)

In 52 BC a general rising of the Gallic tribes under Vercingetorix of the Arverni mounted the largest coordinated resistance Caesar faced during his conquest of Gaul. After initial success at Gergovia, Vercingetorix withdrew to the hilltop fortress of Alesia, where Caesar constructed double lines of fortifications, an inner blockade and an outer defense against relief forces. A huge Gallic relief army arrived and attacked the Roman works, but after days of fighting the relieving force was broken and the besieged city, short of food, capitulated. Ancient sources state Vercingetorix surrendered in person and was later executed after Caesar's triumph in 46 BC. Alesia ended organized Gallic resistance and became one of the most studied sieges of antiquity, with the site excavated since the 19th century.

Location: Alise-Sainte-Reine, France

In 43 AD Emperor Claudius ordered the invasion of Britain, dispatching four legions under Aulus Plautius that landed on the Kentish coast and defeated the Catuvellauni king Caratacus. Roman forces pushed from the southeast toward the Thames, and Claudius himself crossed to accept the submission of several British kings, entering the capital Colchester in triumph. The invasion began nearly four decades of campaign against the tribes of Wales, northern England, and Scotland, in which figures such as Caratacus and later Boudica led prolonged resistance. Roman Britain would endure for over 350 years, and the conquest permanently drew the island's Celtic-speaking peoples into the imperial world. Some tribes, notably in the far north, were never absorbed, their frontier later marked by Hadrian's Wall.

Location: Britain

In 60 or 61 AD, after Roman officials seized the lands of the Iceni on the death of their king Prasutagus and flogged his widow Queen Boudica and violated her daughters, the Iceni and Trinovantes rose in a massive revolt. Boudica's forces destroyed the provincial capital Camulodunum, annihilated a Roman legion's infantry, and burned Londinium and Verulamium, killing tens of thousands in what Tacitus and Cassius Dio describe as the greatest crisis of Roman Britain. Governor Gaius Suetonius Paulinus, hurrying back from Anglesey, met the rebels on a battlefield of his choosing and destroyed their army with a much smaller force. Dio's account says Boudica poisoned herself rather than be captured. The revolt's suppression secured Roman rule for three more centuries, while Boudica's memory was revived in modern Britain as a national symbol.

Location: Britain