Sign of King Sancho VII of Navarre Commonly known as "Arrano Beltza"  (The Black Eagle Emblem).
Menéndez Pidal, Faustino (2004). El Escudo de España. Madrid, Real Academia Matritense de Heráldica y Genealogía. ISBN 84-88833-02-4
Eagle design File:AntsoVIIArrano.JPG
Heralder Elements of File:Arrano Beltza.svg