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The oldest of the Latin sacramentaries or liturgical books. It was erroneously attributed to Pope Leo I and was in use from the fourth to the seventh centuries. It contains neither canons nor the Ordinary of the Mass, but many propers, collects, prefaces, secrets, postcommunions, and orations, together with ordination forms. Many of these prayers are still in use today.
All items in this dictionary are from Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.