[2] Tradition relates that in the year 538 Bieuzy went up the Blavet valley in the company of Gildas (who had previously founded the monastery [fr] of Saint-Gildas-de-Rhuys): they established a hermitage or oratory consisting of a natural cave in a huge pile of rocks on the banks of the Blavet near Castennec.
Around 570, a servant asked him to interrupt his mass to go and heal his lord's pack of dogs suffering from rabies, but Bieuzy refused.
The furious Breton lord came to split his skull with a sword (an axe, knife or cutlass according to other versions of the legend), the blow being so violent that the weapon remained planted there.
Bieuzy found the strength to walk 80 kilometres (50 mi) to the abbey of Rhuys where he died under the blessing of his master, Saint Gildas.
The legend also tells that the Breton lord, on his return home, found that all his horses and farm animals had gone mad; the dogs bit the tyrant and his servants to death.