Legend says the St. Gregory The good (d. 604) read the primary three traces chanted by angels on a specific Easter morning in Rome though he walked barefoot in a fantastic spiritual procession and that the saint thereupon included the fourth line: “Ora pro nobis Deum. Alleluia.” Almighty, eternal God, https://vitapronobis04692.thelateblog.com/31665501/the-best-side-of-vita-pro-nobis