Cyclopedia of Biblical, Theological and Ecclesiastical Literature
ST., a French nun, was born in Normandy, in the diocese of Seez, near the opening of the 8th century. Descended from one of the first families of Hiemois (now country of Auge), she entered the monastery of Montreuil, of which she soon became the abbess. Already familiar with privations and austerities, she redoubled her fervor in retreat. She had a brother called Chrodegand; who was elected bishop; of Seez in 756 and was assassinated a few years after by his godson in the borough of Nonlant. She died at Montreuil, April 22, 770, and her name is inserted in the Roman martyrology. In 878 Hildebrand, bishop of Seez, brought the body of Sainlte Olpporitune to Moussy-le-Neut, in the diocsese of Meaux and shortly after transferred it to Paris. The remains of the saint were thrown into the immense receptacle of the catacombs in 1797. Her life was written before 888 by Adelhelme, bishop of Seez. It is found in the Bollandists and in Mabillon. See Acta Sanctorum, April 22; Mabillon, Acta Sanctorunt Ordinis S. Benedicti, pt. ii, ssec. 3, p. 220; Gallia Christiana, vol. 11; Nicolas Gosset, Vie de Sainte Oppaortune.
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McClintock, John. Strong, James. Entry for 'Opportune'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/o/opportune.html. Harper & Brothers. New York. 1870.