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Desiderius was born at Autun, Gaul, and also known as Didier. He became bishop of Vienne. His enforcement of strict clerical discipline, his attachs on simony, and his denunciation of the immorality of Queen Brunhildis' court made him many enemies. He was denounced by the queen for paganism to Pope Gregory the Great who completely exonerated him, but was banished by a synod controlled by Brunhildis. Desiderius returned four years later but was murdered by three followers of King Theodoric, whom he had publicly censured. His feast day is May 23.
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