of Breviary
Source: Webster's dictionaryThe arrangement of the Psalms in the Rule of St. Benedict had a profound impact upon the breviaries used by secular and monastic clergy alike, up until 1911 when Pope St. Pius X introduced his reform of the Roman Breviary. Source: Internet
However, mendicant friars travelled around a lot and needed a shortened, or abbreviated, daily office contained in one portable book, and single-volume breviaries flourished from the thirteenth century onwards. Source: Internet
Later printed breviaries usually have woodcut illustrations, interesting in their own right but the poor relation of the beautifully illuminated breviaries. Source: Internet