The Roman colony of Emerita Augusta (present day Mérida) was founded in 25 BC by Augustus, to resettle emeritus soldiers discharged from the Roman army from two veteran legions of the Cantabrian Wars: Legio V Alaudae and Legio X Gemina. Three years later it became the capital of the new Roman province of Lusitania, which included approximately all of modern Portugal south of the Douro river and part of modern Spain (Extremadura and a small part of Salamanca, in Castile and León). The well-preserved remains of the old city include, in particular, a large bridge over the Guadiana, an amphitheatre, a theatre, a vast circus and an exceptional water-supply system. It is an excellent example of a provincial Roman capital during the empire and in the years afterwards.