The conquest of Alagón by Alfonso I Historical milestone · Alagón, Ribera Alta del Ebro, Zaragoza Image of Alagón, not of the place itself. Alagón, a prominent stronghold of the Upper March of al-Andalus for four centuries, was taken by Alfonso I the Battler in 1119, a year after the fall of Zaragoza. The minaret tower of the mosque was reused as a Christian bell tower. 1119 Photo: Zagri (CC BY-SA 4.0) What to see and do in Alagón