Gradlon the Great (Gradlon Meur) was a semi-legendary 5th century "king" of Cornouaille who became the hero of many Breton folk stories. The most famous of these legends is the story of the sunken city of Ys. He is supposed to have been the son of Conan Meriadoc, but Conan lived much earlier in the late 4th Century.
- ^ Bonnet, Philippe. Quimper : la Cathédrale. Paris: Zodiaque, 2003.