Wars in 146 BC, the Romans turned their attention to conquering Hispania. The tribe of the Gallaeci 60,000 strong, according to Paulus Orosius, faced the Roman forces led by Decimus Junius Brutus Callaicus in 137 BC in a battle at the River Douro. From this time, Gallaic fighters joined the Roman legions, to serve as far away as Dacia and Britain. The final extinction of Celtic resistance was the aim of the violent and ruthless Cantabrian Wars fought under the Emperor Augustus from 28 to 19 BC. The Roman city was founded in 14 BC, being entitled by Emperor Octavian as Asturica Augusta now known as Astorga. It became an important administrative and military centre. The Roman walls were rebuilt by Bishop Nuño around 1242 and they underwent several repairs during the Middle Ages. The city had thermal baths with hot, warm, cold water systems, sauna's and two main sewer system still in use today. Ruins of Roman baths are still visible today. In 35 AD as mining plans developed, this Roman Hispania castra was redesigned and built with the help of the army, into a city. A provincial capital, and the meeting-place of four military roads. Vía de la Plata (Silver Way) or Ruta de la Plata (Silver Route) is an ancient commercial and pilgrimage path that connects Astorga to Mérida. It was conceived and built as a trade route for the exploitation of gold. The Roman causeway allowed the Romans to conquer tribes such as the Callaici, the Astures, and the Vacceos. Pliny the Elder in 73 AD spoke of Vía de la Plata. The road stretched around and the Roman's highest importance for he gold mines of Las Médulas and the copper mines of Rio Tinto. Asturica was the main city in northwest Spain during the Roman Empire. Plinius Roman author, naturalist, and natural philosopher, as well as naval and army commander called the city Urbs magnifica ("magnificent city"). The Via Platea went from Asturica (Astorga) to Emerita (Mérida). One of the first three bishoprics in Spain was founded in Astorga, known as the Roman Catholic Diocese of Astorga. The title of Bishop of Astorga is one of the oldest religious charges of Europe. Astorga was sacked by the Visigothic King Theodoric II sometime during time of his rule. On 5 October 456, at the Battle at the Campus Paramus, from Astorga on the Urbicus (Órbigo), Theoderic