papal burials obscuring the prominence that Sergius believed Leo's tomb should have. Significance Pope Benedict XVI said that Leo's papacy was "undoubtedly one of the most important in the Church's history". In 1754 Pope Benedict XIV proclaimed Leo I a Doctor of the Church. Next to Leo only one other pope, Gregory I, is also recognized as Doctor of the Church. The Catholic Church marks 10 November as the feast day of Saint Leo, given in the Martyrologium Hieronymianum and the 8th-century Calendar of Saint Willibrord as the date of his death and entry to heaven. His feast was once celebrated in Rome on 28 June, the anniversary of the placing of his relics in Saint Peter's Basilica, but in the 12th century, the Gallican Rite feast of 11 April was admitted to the General Roman Calendar, which maintained that date until 1969. Some traditionalist Catholics continue to observe pre-1970 versions of that calendar. The Eastern Catholic Churches as well as the Eastern Orthodox Church celebrate Saint Leo on 18 February. Leo the Great is honored in the Church of England and in the Episcopal Church on 10 November. Hymns Troparion (Tone 3) You were the Church's instrument in strengthening the teaching of true doctrine; you shone forth from the West like a sun dispelling the errors of the heretics. Righteous Leo, entreat Christ God to grant us His great mercy. Troparion (Tone 8) O Champion of Orthodoxy, and teacher of holiness, The enlightenment of the universe and the inspired glory of true believers. O most wise Father Leo, your teachings are as music of the Holy Spirit for us! Pray that Christ our God may save our souls! Kontakion (Tone 3) Seated upon the throne of the priesthood, glorious Leo, you shut the mouths of the spiritual lions. With divinely inspired teachings of the honored Trinity, you shed the light of the knowledge of God up-on your flock. Therefore, you are glorified as a divine initiate of the grace of God. See also Christology List of 10 longest-reigning popes List of Eastern Orthodox saints List of popes References Bibliography Louise Ropes Loomis, (2006) The Book of Popes (Liber Pontificalis). Merchantville, NJ: Evolution Publishing. (Reprint of the 1916 edition. English translation with scholarly footnotes, and illustrations). John Given, (2014) The Fragmentary History of Priscus: Attila, the Huns and the Roman Empire. Merchantville, NJ: Evolution Publishing. . Basil Studer: Art."Leo the