Aratis, the Celtiberian city Historical milestone · Aranda de Moncayo, Aranda, Zaragoza Image of Aranda de Moncayo, not of the place itself. The site of some twelve hectares located in the district of Aranda corresponds to the Celtiberian city of Aratis, founded in the sixth century BC and from which the valley takes its name. It was declared a bien de interés cultural in 2016 after years of looting. siglo VI a. C. Photo: Ecelan (CC BY-SA 3.0) What to see and do in Aranda de Moncayo