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.

@Evangelizo