Bursau, Celtiberian Borja Historical milestone · Borja, Campo de Borja, Zaragoza Image of Borja, not of the place itself. The hill that dominates present-day Borja was occupied from the fifth century BC by the Celtiberian settlement of Bursau, which came to mint its own coinage. From that place name derived the Arabic Burya and, with the Christian conquest, the Castilian name of the villa. siglo V a. C. Photo: Iggy1975 (CC0) What to see and do in Borja