Catalonia
Pre-Roman and Roman period

In pre-Roman times, the area that is now called Catalonia in the north-east of Iberian Peninsula – like the rest of the Mediterranean side of the peninsula – was populated by the Iberians. The Iberians of this area – the Ilergetes, Indigetes and Lacetani (Cerretains) – also maintained relations with the peoples of the Mediterranean. Some urban agglomerations became relevant, including Ilerda (Lleida) inland, Hibera (perhaps Amposta or Tortosa) or Indika (Ullastret). Coastal trading colonies were established by the ancient Greeks, who settled around the Gulf of Roses, in Emporion (Empúries) and Roses in the 8th century BC. The Carthaginians briefly ruled the territory in the course of the Second Punic War and traded with the surrounding Iberian population.

After the Carthaginian defeat by the Roman Republic, the north-east of Iberia became the first to come under Roman rule and became part of Hispania, the westernmost part of the Roman Empire. Tarraco (modern Tarragona) was one of the most important Roman cities in Hispania and the capital of the province of Tarraconensis. Other important cities of the Roman period are Ilerda (Lleida), Dertosa (Tortosa), Gerunda (Girona) as well as the ports of Empuriæ (former Emporion) and Barcino (Barcelona). As for the rest of Hispania, Latin law was granted to all cities under the reign of Vespasian (69–79 AD), while Roman citizenship was granted to all free men of the empire by the Edict of Caracalla in 212 AD (Tarraco, the capital, was already a colony of Roman law since 45 BC). It was a rich agricultural province (olive oil, wine, wheat), and the first centuries of the Empire saw the construction of roads (the most important being the Via Augusta, parallel to Mediterranean coastline) and infrastructure like aqueducts.

Conversion to Christianity, attested in the 3rd century, was completed in urban areas in the 4th century. Although Hispania remained under Roman rule and did not fall under the rule of Vandals, Suebi and Alans in the 5th century, the main cities suffered frequent sacking and some deurbanization.
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