23 May - Didier de Vienne or Didier d'Autun was bishop of Vienne, in the Dauphiné region, from the extreme end of the 6th century and the beginning of the following century. He would have left very young to join around 558 Namatius bishop of Vienne. Around 570, Bishop Philippe would have made him join the clergy of his church.

In 586, he would have become a deacon under the episcopate of Vere II. Didier acceded to the archiepiscopal see of Vienna, at the death of Vère II, during the year 596. Having criticized the conduct of the Queen Mother Brunehaut, the latter, reputed to be belligerent and manipulative, intrigues her son Thierry II, King of Burgundy. Didier was deposed and banished in 603, at a council of bishops meeting in Chalon-sur-Saône. He was exiled to "Levise", the Isle of Leuvis in Scotland, for four years until Brunehaut authorized his return. This episode is dated 607. The former bishop was restored to his duties on his return.

According to tradition, he was taken, under escort, from Vienna to the court of Chalon-sur-Saône or Autun, where Brunehaut had him murdered in Priscianicum (Saint-Didier-sur-Chalaronne) where his body was buried. Domnole, who is the author of the removal of these relics to the church of Saint-Pierre in Vienne, succeeds him in the metropolitan seat of Vienne.