Belsinon, Celtiberian and Roman Mallén Historical milestone · Mallén, Campo de Borja, Zaragoza Mallén occupies the site of the Celtiberian city of Belsinon, called Balsio in Roman times and located on the road that linked the Ebro with the meseta. The site of El Convento has yielded Hispanic terra sigillata pottery and remains of the imperial period. siglo I Photo: Xufanc (CC BY-SA 3.0) What to see and do in Mallén