I've begun reading the fourth book of John of Salisbury's Policraticus. In the first chapter:
>So, for instance, during the depredations of the Huns, Attila was asked, by the devout bishop of a certain city, who he was, and replied, "I am Attila, the scourge of God." It is written that, when the bishop had reverenced the divine Majesty in him, he said, "Welcome to the servant of God," and, repeating, "Blessed is he that cometh in the name of the Lord," opened the doors of the church and admitted the persecutor, and through him attained to the palm of martyrdom. For he did not dare to shut out the scourge of God, knowing as he did that it is the beloved son that is scourged, and that the very power of the scourge comes from the Lord alone.
What is this saying about the Princeps?