Primera Guerra Civil Castellana
Once the Castilian Civil War came to an end with the triumph of Queen Isabella of Castile, the Basque interclan warfare generally ended as well, but even long before, since the 14th century, the Mendoza were jockeying for position and privilege in Castile, an expanding military power. By virtue of the Mendozas' status as knights and free men, they became Castilian nobility with Álava's annexation ("hidalgos"). All members of the noble class were knights, administrators, or lawyers, and served in the administration of the realm. The largest family's responsibility was to form and maintain a local army that they could make available if called on by the king. The highest nobility became direct vassals of the king.