Hoèl of Cornwall was count of Nantes, from 1148 to his death. He was raised the son of Duke Conan III and Maud FitzRoy, an illegitimate daughter of King Henry I of England. However, he was disinherited by his father when on his death-bed, as Conan III claimed that Hoèl was illegitimate and no son of his. Bertha then became heiress to Duke Conan's lands in Brittany, while Hoèl was allowed to remain Count of Nantes. He was accused by St. Bernard of Clairvaux of having an incestuous affair with his sister Bertha.