Castelo de Vide is a municipality in Portugal, with a population of 3,407 inhabitants in 2011, in an area of 264.91 square kilometres. It is uncl…Castelo de Vide is a municipality in Portugal, with a population of 3,407 inhabitants in 2011, in an area of 264.91 square kilometres. It is unclear when humans settled Castelo de Vide, although archaeologists suggest the decision came from the morphology of the soil and from a territorial strategy to occupy and conquer land. The establishment of a fortification helped fix a new population to the territory and, at the same, functioned as a strategic border fortress. Castelo de Vide became its own municipality in 1276, before which it was part of Marvão.