And it came to pass on this wise. A certain man had a bull grazing with the flock upon Mount Gargano, and it strayed. And when they had sought it for a long while they found it jammed in the mouth of a cavern. Then one that stood there shot an arrow at it to slay it, but the arrow turned round and came back against him that had shot it. They therefore that saw it, and all those that heard it, were sore afraid because of that which had come to pass, so that no man dared any more to draw near to the cavern. But when they had sought counsel of the Bishop of Siponto, he answered, that it behoved to seek the interpretation from God, and proclaimed three days of fasting and prayer.
After three days the Archangel Michael gave warning to the Bishop that that place was under his protection, and that he had thus pointed out by a sign that he wished that worship should be offered to God there, with remembrance of himself and of the Angels. Then the Bishop and the citizens made haste and came to the cavern; and when they found that the form thereof was somewhat after the fashion of a Church they began to perform the public worship of God therein: which sanctuary hath been glorified with many miracles. It was not long after these things that Pope Boniface IV hallowed the Church of St. Michael on Hadrian's Mole at Rome, on the 29th day of September, on the which day the Church also holdeth in remembrance All Angels. But this present day is hallowed in remembrance of the manifestation of the Archangel Michael.