Saint-Jean-de-Maurienne (French pronunciation: ​[sɛ̃ʒɑ̃ d(ə) mɔ.ˈʁjɛn]; Arpetan: Sent-Jian-de-Môrièna) is a commune in the Savoie department in the Rhône-Alpes region in south-eastern France. It is a sub-prefecture of the department.It lies in the Maurienne, the valley of the River Arc. It was also an Episcopal See of Savoy during the Ancien Régime and again from 1825 to 1966. Its original name was simply Maurienne, or Moriana in Italian and Latin.