Roman Algarve - Milreu, Ossonoba, Cerro da Vila

History & Heritage

The Roman presence in the Algarve lasted for over six centuries, from the conquest of the Iberian Peninsula in the 2nd century BC to the collapse of Roman authority in the 5th century AD. During this period, the region developed a sophisticated network of towns, villas, roads, ports and agricultural estates whose remains provide some of the most important archaeological sites in southern Portugal.

Ossonoba, located beneath the modern city of Faro, was the principal Roman town of the Algarve. It served as a regional capital and a significant port. Little of Roman Ossonoba is visible above ground, but excavations have revealed sections of the town walls, mosaics, a temple platform and evidence of a substantial settlement. Fragments of Roman masonry are incorporated into Faro's medieval walls.

Millreu, located just north of Faro near Estoi, is the most impressive Roman site in the Algarve. This extensive villa complex, occupied from the 1st to the 5th century AD, includes a peristyle house with mosaic floors, thermal baths, agricultural buildings and a remarkable temple later converted into a church. The temple's walls retain striking polychrome mosaics depicting fish. The site is well presented with interpretive panels and a visitor centre.

The thermal baths at Milreu are among the best-preserved in the Algarve, with their heating system (hypocaust), plunge pools and changing rooms still clearly visible. The villa's mosaics indicate the wealth of its owners, who were likely engaged in the processing and export of garum, the fermented fish sauce that was one of the Roman Algarve's most important industries.

Cerro da Vila, in Vilamoura, is another significant Roman site, comprising a villa, a bath complex, a harbour and associated industrial buildings. The site provides evidence of the Roman fishing and fish-processing industry, including tanks for producing garum. The mosaics and architectural details are displayed in a small on-site museum.

Garum production was a major industry in the Roman Algarve. This fermented fish sauce, prized throughout the Roman Empire, was produced in factories along the coast. The Algarve's abundant tuna, sardine and mackerel populations provided the raw material, and the region's salt pans supplied the salt essential to the fermentation process.

The Roman road network connected the Algarve's towns and linked them to the wider empire. The principal route ran along the coast from Baesuris (Castro Marim) through Ossonoba (Faro) to Lacobriga (Lagos), roughly following the line of the modern EN125.

Other Roman sites include the remains at Boca do Rio near Burgau and at Abicada near Portimao. The Roman legacy extends beyond physical remains: the region's tradition of salt production, its fishing economy, its viticulture and its road network all have Roman roots.