Douro River in the context of "Castile and León"

Galician–Portuguese (Galician: galego-portugués or galaico-portugués; Portuguese: galego-português or galaico-português), also known as Old Galician–Portuguese, Galaic-Portuguese, or (in contexts focused on one of the modern languages) Old Galician, Old Portuguese, Medieval Galician or Medieval Portuguese, was a West Iberian Romance language spoken in the Middle Ages, in the northwest area of the Iberian Peninsula. It is both the ancestor language and historical period of development of modern Galician, Fala, Portuguese and Eonavian languages which maintain a high degree of mutual intelligibility.

Galician–Portuguese was first spoken in the area bounded in the north and west by the Atlantic Ocean and by the Douro River in the south, comprising Galicia and northern Portugal, but it was later extended south of the Douro by the Reconquista.

Lusitania (/ˌluːsɪˈteɪniə/; Classical Latin: [luːsiːˈtaːnia]) was an ancient Iberian Roman province encompassing most of modern-day Portugal (south of the Douro River) and a large portion of western Spain (the present Extremadura and Province of Salamanca). Romans named the region after the Lusitanians, an Indo-European tribe inhabiting the lands.

The capital Emerita Augusta was initially part of the Roman Republic province of Hispania Ulterior before becoming a province of its own during the Roman Empire.

Castile and León is an autonomous community in northwestern Spain. Castile and León is the largest autonomous community in Spain by area, covering 94,222 km. It is, however, sparsely populated, with a population density below 30/km. While a capital has not been explicitly declared, the seats of the executive and legislative powers are set in Valladolid by law, and for all purposes that city (also the most populated municipality) serves as the de facto regional capital.

Castile and León is a landlocked region, bordered by Portugal as well as by the Spanish autonomous communities of Galicia, Asturias, Cantabria, the Basque Country, La Rioja, Aragon, Castilla–La Mancha, the Community of Madrid and Extremadura. Chiefly comprising the northern half of the Inner Plateau, it is surrounded by mountain barriers (the Cantabrian Mountains to the North, the Sistema Central to the South and the Sistema Ibérico to the East) and most of the territory is drained by the Douro River (Spanish: Duero), flowing west toward the Atlantic Ocean.

The staple right, also translated stacking right or storage right, both from the Dutch stapelrecht, was a medieval right accorded to certain ports, the staple ports. It required merchant barges or ships to unload their goods at the port and to display them for sale for a certain period, often three days. This system, known in German as Stapelrecht and in French as droit d’étape, was common throughout medieval Europe, particularly within the Holy Roman Empire, where it granted cities along major trade routes the privilege to compel passing merchants to offer their goods for local sale.

In 1254 the Portuguese Cortes of Leiria created staple laws on the Douro River, favoring the new royal city of Vila Nova de Gaia at the expense of the old episcopal city of Porto.

Lusitania (/ˌluː.sɪ.ˈteɪ.ni.ə/; Classical Latin: [luːsiːˈtaːnia]) was an ancient Roman province encompassing most of modern-day Portugal (south of the Douro River) and a large portion of western Spain (the present Extremadura and Province of Salamanca). Romans named the region after the Lusitanians, an Indo-European tribe inhabiting the lands.

The capital Emerita Augusta was initially part of the Roman Republic province of Hispania Ulterior before becoming a province of its own during the Roman Empire.