The original march of Brittany was created and militarized under the Merovingians in the late 7th or early 8th century. Although its exact extent is unknown and its boundaries do not coincide with the later Breton March; it included the Rennais and Nantais territories (French: "pays"), and parts of the Vannetais and Maine. Administration centered in Le Mans and the territory eventually went by the name of "ducatus Cenomannicus" or Duchy of Maine. One of the most famous margraves (""Britannici limitis praefectus"") was Roland, who died at the Battle of Roncesvalles in 778 and gave rise to a famous series of legends as exemplified in the eponymous "Chanson de Roland".