Gregory the Great urged the people to do penance, and a general procession was formed.

It was to proceed from Ara Coeli to St.Peter's.

As it passed before the mole of Adrian, now the Castle of St.Angelo, the sound of heavenly voices was heard singing (it was Easter morn,) Regina Coeli, laetare! alleluia! quia quem meruisti portare, alleluia! resurrexit sicut dixit; alleluia!" The Pontiff, carrying in his hands the portrait of the Virgin, (which is over the high altar and is said to have been painted by St.Luke,) answered, with the astonished people, 'Ora pro nobis Deum, alleluia!' At the same time an angel was seen to put up a sword in a scabbard, and the pestilence ceased on the same day.

There are four circumstances which 'CONFIRM'-- [The italics are mine--M.

T.]--this miracle: the annual procession which takes place in the western church on the feast of St Mark; the statue of St.Michael, placed on the mole of Adrian, which has since that time been called the Castle of St.
Angelo; the antiphon Regina Coeli which the Catholic church sings during paschal time; and the inscription in the church.".