The urban development of Segóbriga dates from the first century B.C., and the city’s theatre, amphitheatre, basilica, porticoes, thermal baths, etc. were built in the 1st and 2nd centuries A.D. In addition to the splendour of its buildings, Segóbriga must also have been an important administrative centre for the surrounding territories, given the great architectural and mining riches in the area.