The Phoenicians were the master navigators and merchants of the ancient Mediterranean. From their city-states of Tyre, Sidon, and Byblos on the Levantine coast — in what is now Lebanon — they built a maritime trading empire that stretched from the eastern Mediterranean to the Atlantic. By around 800 BC, they had established Gadir (modern Cadiz) at the mouth of the Guadalquivir, the westernmost permanent colony in the ancient world. From Gadir, they ventured beyond the Pillars of Hercules into the open Atlantic, driven by one thing above all: the quest for tin.

Tin was the strategic metal of the Bronze Age. Without it, copper alone was too soft for weapons or tools. The Phoenicians discovered that the richest tin deposits in Europe lay along the Atlantic fringe — in Galicia, northern Portugal, Cornwall, and Brittany. The Greek historian Herodotus called these distant tin sources the Cassiterides, the "Tin Islands." For the Phoenicians, the Atlantic coast of Galicia was not the edge of the world — it was one of the most valuable places in it.

In the lower valley of the Guadalquivir, something extraordinary emerged from the meeting of Phoenician merchants and indigenous Iberians: Tartessos, a civilization born around the 9th century BC as a hybrid of both worlds. The Tartessians controlled vast reserves of silver, copper, and gold in southwestern Iberia, and the Phoenicians were their partners and buyers. Tartessian artisans trained in Phoenician goldsmithing techniques produced masterworks like the Treasure of El Carambolo — 21 pieces of gold discovered in 1958 near Seville, including ox-hide pectorals and a necklace with pendants, crafted with Phoenician methods from locally mined gold. At the same site, archaeologists found a temple dedicated to Astarte, the Phoenician goddess of fertility and war.

Tartessos vanished around the 5th century BC, and its disappearance remains one of Iberia's great mysteries. At Casas del Turuñuelo in Badajoz, archaeologists uncovered a dramatic ritual closure: the people held a final banquet, then sacrificed 52 animals — predominantly horses — in three sequential phases, before intentionally destroying and burying their great adobe building under a tumulus 90 meters in diameter. It was a world ending on its own terms. The Tartessians also developed the oldest known indigenous writing system of the Iberian Peninsula — a script derived directly from the Phoenician alphabet. Though Tartessos fell, its cultural DNA — the fusion of Phoenician and Iberian — lived on in the peoples and traditions of southern Spain.

In 2001, construction work at the Museo do Mar de Galicia in Alcabre, Vigo, uncovered one of the most remarkable Phoenician discoveries in Atlantic Europe: an Ibero-Punic altar dedicated to the god Baal, dating to the 4th century BC. The altar — three vertical sacred stones (betilos) within a rectangular enclosure — sat within the Castro da Punta do Muiño do Vento, a coastal settlement inhabited since the 8th century BC. Over 20,000 archaeological pieces were recovered, including the largest concentration of Punic ceramics and amphoras in all of northwestern Iberia. The site was a port sanctuary — a sacred commercial space, visible from the sea, where Phoenician-Punic merchants from the colonies of southern Spain conducted trade with local Castro communities.

The Rías Baixas held a network of these sacred trading spaces. At Castro de Toralla, on Isla de Toralla in the Ría de Vigo, archaeologists found a 1.5-meter granite betilo — a sacred pillar of Phoenician-Punic type — now preserved in the Museo Quiñones de León. On the Monte do Facho, a peak overlooking both the Pontevedra and Vigo estuaries at the tip of the Morrazo peninsula, a hilltop sanctuary with painted ceramics and buildings full of wine amphoras served as another anchor point in the network. At A Lanzada in Sanxenxo, a Phoenician-Punic factory operated the earliest known salting operations in Galicia — fish-preserving techniques that arrived centuries before the Romans. And at Auga dos Cebros in Oia, a rock petroglyph depicting a Phoenician vessel, carved around the 10th century BC, provides some of the oldest evidence of contact between the Mediterranean and the Galician coast.

The Phoenicians transformed Galicia's world without ever settling it permanently. Through their trade networks, iron technology reached the northwest — gradually replacing bronze for tools and weapons and marking the transition from the Bronze Age to the Iron Age in the Castro culture. The potter's wheel arrived, supplementing the hand-built ceramic tradition. Wine and olive oil — luxuries unknown in Atlantic Europe — appeared for the first time at elite Castro feasts, beginning a wine culture that the Romans would later expand into the celebrated vineyards of the Ribeiro.

The Phoenician salting tradition took even deeper root. The fish-preserving techniques introduced by Punic merchants at sites like A Lanzada evolved into a major industry under the Romans — the massive SALINAE complex at O Areal in Vigo operated for centuries as one of the largest salt-production facilities in the entire Empire, built on foundations that Phoenician-era traders had laid. Perhaps most profoundly, the Phoenician trade connected Galicia to the wider Mediterranean world for the first time. A castro dweller in the Miño valley who wore a glass bead from a Phoenician workshop was linked, through chains of trade, to the great cities of the Levant. The same tin that was mined in the hills above Castrelo de Miño may have ended up as bronze armor in Tyre. This was the first globalization — and Galicia was part of it from the very beginning.