Cambio de nombre a Castilblanco de los Arroyos Historical milestone · Castilblanco de los Arroyos, Sierra Norte, Seville Image of Castilblanco de los Arroyos, not of the place itself. The municipality, formerly known simply as Castilblanco, adopted its current name by Royal Decree of 27 June, published on 2 July. 1916 Photo: Junta de Andalucía (CC BY-SA 2.0) What to see and do in Castilblanco de los Arroyos