Legend says the St. Gregory The good (d. 604) listened to the very first three strains chanted by angels on a particular Easter morning in Rome whilst he walked barefoot in a great religious procession and that the saint thereupon included the fourth line: “Ora pro nobis Deum. Alleluia.” Name https://vita-pro-nobis76430.newbigblog.com/37210668/vita-pro-nobis-an-overview