Citations:Gradlon


 * 2021, Mark Piesing, The myths that hint at past disasters, (10 May 2021);
 * In Brittany, the story is about the city of Ys, ruled by King Gradlon, which was protected by a complex series of sea defences that required gates to be opened at low tide to allow excess water to drain off the land. One day, the king’s daughter, Dahut, possessed by a demon, opened these gates at high tide, allowing the ocean to flood the city, and led to the abandonment of the city.