Festivities of Pozuelo de Aragón Activity · Pozuelo de Aragón, Campo de Borja, Zaragoza Image of Pozuelo de Aragón, not of the place itself. Pozuelo de Aragón, founded in 1245 by order of the abbot of the Monasterio de Veruela, celebrates its main festival for Santiago and Santa Ana on 25 and 26 July. Until the 1916 reform of municipal names, the village was simply called Pozuelo. Photo: Diego Delso (CC BY-SA 4.0) What to see and do in Pozuelo de Aragón