Juliobriga was the most important urban centre in Roman Cantabria, as stated by numerous Latin authors including Pliny the Elder. The site has traditionally been identified with ruins in the village of Retortillo in the municipality of Campoo de Enmedio.
Its founding, during the Cantabrian Wars (29 BC-19 BC), made it a powerful symbol of Roman domination of the tribes of the Cantabri. The city was named after the reigning emperor Augustus and his adopted family name, the gens Julia, with the Celtic toponym element -briga, common in Iberia. Due to its strategic location in the Besaya valley, it was able to control trade between the Douro river and the Bay of Biscay. Juliobriga grew slowly, reaching its peak between the end of the 1st century and the early 2nd century AD. Following that, its population began to decline, until the city was completely abandoned in the 3rd century.
The ruins of Retortillo were first identified with Julióbriga in the second half of the 18th century by Enrique Florez. Numerous historians and archaeologists have worked on the site since, including some of Spain's foremost.
References:The Château du Lude is one of the many great châteaux of the Loire Valley in France. Le Lude is the most northerly château of the Loire Valley and one of the last important historic castles in France, still inhabited by the same family for the last 260 years. The château is testimony to four centuries of French architecture, as a stronghold transformed into an elegant house during the Renaissance and the 18th century. The monument is located in the valley of Le Loir. Its gardens have evolved throughout the centuries.