Incorporation of Borja into the Kingdom of Aragon Historical milestone · Borja, Campo de Borja, Zaragoza Image of Borja, not of the place itself. Borja passed into Christian hands in the first third of the twelfth century, during the advance of Alfonso I the Battler along the Huecha valley. The villa remained as a frontier stronghold facing Castile and Navarre and retained a numerous Mudéjar population. siglo XII Photo: Iggy1975 (CC0) What to see and do in Borja