“ DOON DE MAYENCE, a hero of romance, who gives his name to the third cycle of the Charlemagne romances, those dealing with the feudal revolts. There is no real unity in the geste of Doon de Mayence. The rebellious barons are connected by the trouvères with Doon by imaginary genealogical ties, and all are represented as in opposition to Charlemagne, though their adventures, in so far as they possess a historical basis, must generally be referred to earlier or later periods than the reign of the great emperor. ”