The Most Ancient Lives of Saint Patrick/The Life and Acts of St. Patrick/Chapter 9
Of the Cow freed from an Evil Spirit, and Five other Cows restored to Health.
The aunt who had nursed Saint Patrick had many cows, one of which was tormented with an evil spirit; and immediately the cow became mad, and tore with her feet, and butted with her horns, and wounded five other cows, and dispersed the rest of the herd. And the owners of the herd lamented the mishap, and the cattle fled from her fury as from the face of a lion. But the boy Patrick, being armed with faith, went forward, and, making the sign of the cross, freed the cow from the vexation of the evil spirit; then drawing near to the wounded and prostrate cows, having first prayed, he blessed them and restored them all even to their former health. And the cow, being released from the evil spirit, well knowing her deliverer, approached with bended head, licking the feet and the hands of the boy, and turned every beholder to the praise of God and the veneration of Patrick.