Legend states the St. Gregory The good (d. 604) listened to the very first a few traces chanted by angels on a certain Easter early morning in Rome while he walked barefoot in a great religious procession and the saint thereupon added the fourth line: “Ora Professional nobis Deum. Alleluia.” https://vitapronobis54208.vidublog.com/30403519/a-review-of-vita-pro-nobis