Didier of Rennes
Saint Didier of Rennes was a 7th-century bishop; he was born in Rennes, in Brittany, and died near what is now called Saint-Dizier-l'Évêque in the Territoire de Belfort, in France.

Biography 
Didier was born in Rennes in the 7th century, where he studied and became bishop. He went on a pilgrimage to Rome in a group that included Saint Reinfroid. On the return voyage he passed through German lands and then south of the Vosges, near today's Saint-Dizier-l'Évêque, around 672 or 673, and was welcomed in the local church.

Having preached there, he went on the road again but was soon attacked by robbers who killed him and his acolytes near the village of Croix, Territoire de Belfort. Didier was buried in the church and a cult arose around him, as is attested in a 727 charter in Murbach Abbey. Various miracles are ascribed to him. His feast day is 18 September.

The feet of Saint Dizier 
A rock named "The step of the devil and the feet of Saint Didier", found near Saint-Dizier-l'Évêque, has indentations that local legend claims are the remains of a struggle between the devil and the saint.

Towns named for Saint Didier
Many communities in France are named for this Saint Didier including Saint-Didier, Ille-et-Vilaine, but many honor other saints of the same name.

See also 
 Liste des évêques de Rennes

References

Bibliographie

External links
 
 

7th-century Frankish bishops