Historic fountain of Mallén Monument · Mallén, Campo de Borja, Zaragoza Image of Mallén, not of the place itself. The historic fountain of Mallén stands in a town built on the site of the Celtiberian city of Belsinon, called Balsio in Roman times; recovered by Alfonso I in 1119, it received a charter of privileges in 1132, and its castle served as barracks for French troops during the Peninsular War before being dismantled. Photo: Vasyatka1 (CC BY-SA 4.0) What to see and do in Mallén