Roman Breviary - Breviarium Romanum Latin-English Bilingual Diurnal. The Breviary contains the daily psalms, hymns, prayers, lessons, etc., necessary for reciting the office for each day, to be recited by those in orders in the Roman Catholic Church, and/or the laity.The breviary (Latin: breviarium) is a liturgical book used in Christianity for praying the canonical hours. Compiled and Translated by The Benedictine Nuns of Stanbrook Abbey (et al.).