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And because the mortality ceased not, he ordained a procession, in the which he did do bear an image of our Lady, which, as is said, S. Luke the Evangelist made, which was a good painter, he had carved it and painted after the likeness of the glorious Virgin Mary. And anon the mortality ceased, and the air became pure and clear, and about the image was heard a voice of angels that sung this anthem: Regina cæli lætare, etc., and S. Gregory put thereto: Ora pro nobis, deum rogamus, alleluia. At the same time S. Gregory saw an angel upon a castle which made clean a sword all bloody, and put it into the sheath, and thereby S. Gregory understood that the pestilence of this mortality was passed, and after that it was called the Castle Angel.

And because the mortality ceased not, he ordained a procession, in the which he did do bear an image of our Lady, which, as is said, S. Luke the Evangelist made, which was a good painter, he had carved it and painted after the likeness of the glorious Virgin Mary. And anon the mortality ceased, and the air became pure and clear, and about the image was heard a voice of angels that sung this anthem: Regina cæli lætare, etc., and S. Gregory put thereto: Ora pro nobis, deum rogamus, alleluia. At the same time S. Gregory saw an angel upon a castle which made clean a sword all bloody, and put it into the sheath, and thereby S. Gregory understood that the pestilence of this mortality was passed, and after that it was called the Castle Angel.

Castel Sant'Angelo

The liturgy for the Rogation Days, during which the priest is vested in purple, begins with Psalm 43:26 --"Arise, O Lord, help us and redeem us for Thy name's sake" -- which is followed by the Litany of the Saints. At the Litany's "Sancta Maria," all stand and a procession begins, which in older times was (and still is in rural areas) usually around the boundaries of the parish, giving to the procession the name of "beating the bounds."

In the Golden Legend, Jacobus de Varagine pens the following about St. Gregory I and the Roman Plague of 540:

And because the mortality ceased not, he ordained a procession, in the which he did do bear an image of our Lady, which, as is said, S. Luke the Evangelist made, which was a good painter, he had carved it and painted after the likeness of the glorious Virgin Mary. And anon the mortality ceased, and the air became pure and clear, and about the image was heard a voice of angels that sung this anthem: Regina cæli lætare, etc., and S. Gregory put thereto: Ora pro nobis, deum rogamus, alleluia. At the same time S. Gregory saw an angel upon a castle which made clean a sword all bloody, and put it into the sheath, and thereby S. Gregory understood that the pestilence of this mortality was passed, and after that it was called the Castle Angel.