The handover of Serón to the Bishop of Sigüenza Historical milestone · Serón de Nágima, Las Vicarías, Soria Image of Serón de Nágima, not of the place itself. Alfonso VII handed over the town in 1138 to the bishop of Sigüenza so that he would drive its repopulation. The place had already been occupied in the Bronze Age, in Celtiberian times and in the Roman period, according to the remains that appeared in the municipal district. 1138 Photo: Dgarcia29 (CC BY-SA 3.0) What to see and do in Serón de Nágima