Fernán González

…the counties were united by Fernán González (died 970), the first count of all Castile. With him the political history of Castile begins. He made the new county hereditary in his family and thus secured it a measure of autonomy under the kings of Leon. In his time the capital…

Fernán González (c. 930–970), the count of Castile, defied Ramiro and established the foundations for the later independence of Castile.

…Castilian separatist movement led by Fernán González, the first count of unified Castile, a region that eventually came to dominate Spain militarily, politically, and linguistically.

…against the count of Castile, Fernán González. Sancho I of Leon, deposed by the Castilian, took refuge in Navarre; García took to the field and in 960 managed to capture the famous Castilian, holding him prisoner for many years. García was succeeded by his son, Sancho II Garcés.