Fuero de Villarreal de San Nicolás de Orio Historical milestone · Orio, Urola Kosta, Gipuzkoa King Juan I of Castile granted Orio its charter (fuero) on 12 July 1379, formally founding it as Villarreal de San Nicolás de Orio. 12 de julio de 1379 Photo: Zarateman (CC BY-SA 4.0) What to see and do in Orio