abstract:The Four Sons of Aymon (, , ), sometimes also referred to as Renaud de Montauban (after its main character) is a medieval tale spun around the four sons of Duke Aymon: the knight Renaud de Montauban (also spelled Renaut, Renault, , ), his brothers Guichard, Allard and Richardet, their magical horse Bayard (), their adventures and revolt against the emperor Charlemagne. The story had a European success and echoes of the story are still found today in certain folklore traditions.