Galician-Portuguese is a historical language that originated in the medieval period, primarily spoken in the regions of Galicia in northwest Spain and Portugal. It evolved from the Latin spoken in the Iberian Peninsula and was used in literature and administration during the 12th to 14th centuries. Over time, the language diverged into two distinct forms: Galician, which is still spoken in Galicia, and Portuguese, the official language of Portugal and Brazil. Despite their separation, both languages share many similarities in vocabulary and grammar, reflecting their common heritage.