- 3 July
- Prince who became a hermit in Brittany.
The local lord, Grallon, gave Gunthiern land on the Isle of Groie, near River Blavet to found a monastery.
It survives today as the Benedictine house of Kemperle.
Legend says that insects once threatened to destroy the region's crops.
Count Guerech I of Vannes requested the saint's help.
Gunthiern blessed some water and had it sprinkled over the fields.
The insects fled, and the crops were saved.
- c.500 in Brittany of natural causes;
his body was hidden during the Norman invasions, and was lost for a while;
rediscovered in the 11th century, his relics were translated to the Kemperle monastery
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