The history of Porto dates back to around 300 BC with Proto-Celtic and Celtic people being the first known inhabitants. During the Roman empire, the city developed as an important commercial port, primarily in the trade between Olissipona (the modern Lisbon) and Bracara Augusta (the modern Braga). Porto fell under the control of the Moors during the invasion of the Iberian Peninsula in 711. In 868, Vímara Peres, an Asturian count from Gallaecia, and a vassal of the King of Asturias, Léon and Galicia, Alfonso III, was sent to reconquer and secure the lands back into Christian hands. This included the settlement of Portus Cale and the area that is known as Vila Nova de Gaia. Portus Cale, later referred to as Portucale, was the origin for the modern name of Portugal. In 868, Count Vímara Peres established the County of Portugal.