He is named in the 12th century Crónica Najerense as one of the original judges appointed by Alfonso II King of Asturias to govern Castile. The Chronicon de Cardeña records the appointment by “los Castellanos [de] dos Alcaydes Nuño Rasuera è Lain Calvo” during the reign of King Fruela, adding that “el Conde Ferran Gonzalez” descended from the former. Martínez Díez classifies the existence of these judges as “legendario, producto de la creación literaria, sin ningún apoyo cronístico coetáneo ni documental”, which suggests that Nuño Núñez “Rasura” may not be a historical person at all. 1