Old Spanish, also known as Old Castilian (Spanish: castellano antiguo; Old Spanish: romance castellano [roˈmantse kasteˈʎano]) or Medieval Spanish (Spanish: español medieval), was originally a dialect of Vulgar Latin spoken in the former provinces of the Roman Empire that provided the root for the early form of the Spanish language that was spoken on the Iberian Peninsula from the 10th century until roughly the beginning of the 15th century, before a consonantal readjustment gave rise to the evolution of modern Spanish. The poem Cantar de Mio Cid (The Poem of the Cid), published around 1200, remains the best known and most extensive work of literature in Old Spanish.