The account in which Bishop Ceratius is mentioned are meager and apparently conflicting. But we have definite data which proved his existence as bishop of Grenoble in the middle of the fifth century and also that he was honored in that city a century or so later on June 6. We know that he was present at the Council of Orange in 441, also that he with two other Gallish bishops wrote to Pope St. Leo the Great in 450, and finally there is mention of him in a letter written to the same Pope by Eusebius of Milan. On the other hand, the Gascons claim a Ceratius or Cerasius, as the founder and first occupant of the See of Eauze, later the diocese of Auch. His relics are said to be preserved in the Abbey of Simorre, near Lombez. Theories have been broached that the saint had been driven from Grenoble by the persecution of the Burgundian Arians and then migrated to Aquitaine to found what is now the See of Auch. There is, however, no historical evidence to support these conjectures. The cultus of St. Ceratius of Grenoble was confirmed in 1903. His feast day is June 6.