40.- Historical site of Avilés Avilés appears quoted as a small population in the 10th century. although its peak time starts in the 11th century when Alfonso VI grants jurisdiction and the wall is built. In the 12th century. it was already one of the main ports of Cantabria and a maritime route of entry for pilgrims. This is proven by the expedition of crusaders who in 1189 go to pray before the relics of San Salvador de Oviedo. This splendour increases until the end of the 15th century. when a fire devastates the town. It preserves the urban planning of the old walled town with Calle Ferreria as the main street. as well as a series of important civil and religious buildings. Among the first. the Valdecarzana Palace stands out. built in between the 17th and 18th centuries. Among the second most important. the churches of San Nicolás de Bari and Santo Tomás de Canterbury. the convent of San Francisco. built in the 18th century or the funeral chapel of las Alas. of the 14th century. Despite the loss of importance from the 16th century onwards. the powerful nobility of the town built large palaces in the 17th and 18th centuries such as Camposagrado. built in the location of a low-medieval house-fort. and the palace of Marqués de Ferrera. From the second half of the 19th century. bourgeois urban development emerges outside the walled city. with a series of residential and hotelier buildings in places such as the streets of La Muralla and La Cámara. During the last relevant historical period. the second half of the 20th century. the manufacturing implantation in the estuary will shape a rich industrial patrimony and a worker’s city integrated by functional constructions and paternalistic towns such as Llaranes.