Florentius of Vienne

Florentius is a saint of the Roman Catholic Church and a bishop of Vienne from the late 4th century, dated by his attendance at the Council of Valence in 374.
Florentius' feast day is locally celebrated on 3 January.
Florent or Florentinus is mentioned in the list of bishops of Vienne produced by archbishop Ado of Vienne in his Chronicle, according to which however he lived in the previous century during the reigns of the emperors Volusianus and Gallienus as the 8th bishop of Vienne, and was martyred:

Florentinus, too, bishop of Vienna, distinguished himself by his way of life and his teaching; he remained in place until the reigns of Gallienus and Volusianus, and, in exile, accomplished his martyrdom.