42°59′12″N 4°06′44″W / 42.9866°N 4.1123°W
Juliobriga (Spanish: Julióbriga, Latin: Iuliobriga, Ancient Greek: Ἰουλιόβριγα) was the most important urban centre in Roman Cantabria, as stated by numerous Latin authors including Pliny the Elder.[1] The site has traditionally been identified with ruins in the village of Retortillo (Cantabria) and its Villafría district, in the municipality of Campoo de Enmedio.[2]