recognized as an independent kingdom by the Kingdom of León. Aside of this political division of interests, it was during this time period that the Galician-Portuguese language became a reality and subsequently evidenced the common cultural and linguistic heritage that both kingdoms still shared. Their vernacular language became one of the most important lyrical and literary languages of Europe and was taken in great regard by the neighboring Castilian royal court. Among the conjointly claimed literary production written on any of both sides of the Minho River there is the Cantigas de Santa Maria, the Martín Codax's Pergaminho Vindel or the Cancioneiro da Ajuda. The immersion into the Late Middle Ages signified a progressive historical and cultural deviance between the two territories that couldn't help but increase their geopolitical divergences during the Modern Period. Nevertheless, and despite the territorial expansion of Portugal up to the Algarve, located in the southwestern corner of the Iberian peninsula, both Galicia and the north of Portugal remained closely related from a sociocultural and bioclimatic point of view. Similarly, the Portuguese cities of Porto and Braga, two of the most populated and Ancient urban areas of Portugal, are located quite close to the Galician nearby cities of Vigo and Pontevedra and in a certain way they represent as well a continuation of the moderate south–north conurbation that leads up to the medieval pilgrimage destiny and quintessentially Galician city of Santiago de Compostela. The tepid industrialization of both regions during the 19th and early 20th centuries led to the prevalence of the long lasting dissemination of the rural populations, specially high in Galicia by Spanish standards. This resemblance, a somewhat unique, singular and common trademark of these two regions, has been attempted to be explained by authors of both sides of the Minho River; Galician politician and writer Alfonso Daniel Rodríguez Castelao in his essay book Sempre en Galiza traced this trend back to the Celts idiosyncratic inclination towards Nature, as the already mentioned Castro Culture is considered by some authors to be the local development of Ancient Celtic tribes that settled along the Atlantic regions of northwestern Iberia. Castelao also believed to have found a direct translation and bounding of these pre-Roman settlements with the Christian northwestern parroquias, the traditional political and religious territorial configuration of these very disseminated populations. In an illustrative attempt to clarify this reality, two early to mid 20th century photographers