 However, the transition from "Oped" to "Òpol" (Opulo and Castell d'Òpol on the 13th and 14th centuries, respectively) is rather surprising.It would be logical to assume "*Opedol" as a diminutive form of Oped, which could have designated a small castle in the village as opposed to the fortress which dominates it (it is worth mentioning that the medieval fortress overlooking the village has been known as "castell de Salvaterra" from the 13th century onwards ("salvaterra" being Catalan for "safe land", "asylum place").Périllos is also mentioned in 1100 (Perelons), then Perillons and Perellons in the 13th century.