who had been made a deacon by Leo IV, decreed that the figure of the cock (rooster) should be placed on every church. References Sources Cheetham, Nicolas, Keepers of the Keys, New York: Charles Scribner's Sons, 1983. External links Opera Omnia by Migne Patrologia Latina with analytical indexes Colonnade Statue in St Peter's Square Popes Italian popes Papal saints 790 births 855 deaths 9th-century archbishops 9th-century Christian saints 9th-century popes Burials at St. Peter's Basilica