Isabella I of Castile: A Truly Catholic Queen

Her greatest title was not that of queen or restorer of peace, but that of Catholic, received directly from the hands of the Vicar of Christ in recognition of her invaluable services to the Holy Church.
Charlemagne: Sword and Shield of Christendom

From a merging of providential factors a vast empire was formed, whose wise monarch was perhaps the greatest history has ever known.