Celtiberian city of Segeda Historical milestone · Mara, Comunidad de Calatayud, Zaragoza Image of Mara, not of the place itself. Oppidum of the Belli whose enlargement of walls served Rome as a pretext for the Celtiberian war. In 153 BC its inhabitants, allied with the Arevaci of Numantia, defeated the army of Quintus Fulvius Nobilior; after the setback Rome brought the consular year forward to 1 January. 153 a. C. Photo: Jaime Calatayud (CC BY-SA 4.0) What to see and do in Mara