The colophon at the end of the manuscript establishes with certitude that it was copied at the Cistercian abbey of Hauterive during the thirteenth century. Its author, or the one who commissioned the work, dobutless wanted to “gather together the works of two Cistercian authors who exercised important functions in the region: Henry, Abbot of the neighboring monastery of Hautcrêt, and Amadeus, bishop of the diocese of Lausanne” (from Ciardo). Henry, whose biography is still a subject of debate, chose the learned title Pentaconthamonadius (“the fifty-first”) to designate a sermonary composed of 17 groups of three sermons intended for the liturgy of the White monks. Amadeus of Clermont, a Cistercian monk who became bishop of Lausanne (1145-1159), is the author of eight homilies in honor of the Mother of God, which achieved lasting success as liturgical texts because used in the breviary of the diocese of Lausanne. (jur)

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