First mentions of Uluer Historical milestone · Úrbel del Castillo, Páramos, Burgos Image of Úrbel del Castillo, not of the place itself. The oldest written references to the place appear in 1121 in the forms Uluer or Ulver; in the census of 1787 jurisdiction over the village still belonged to the Duke of Frías. 1121 Photo: Robendo1 (CC BY-SA 4.0) What to see and do in Úrbel del Castillo