The Count of Valentinois was originally the official in charge of the region (county) around Valence (Roman Valentia). It evolved in a hereditary title of nobility, still indicating control of the Valentinois and often of the Diois. The title later became the Duke of Valentinois.
Charles I of Viennois (1338–1380), also king of France as Charles V, Dauphin of Viennois, Count of Diois and Valentinois,[7] Duke of Normandy, ruled the Dauphiné as the first Dauphin of France (1350–1364) and ruled the Dauphiné as king of France (1364–1366)
John III of Viennois, Dauphin of Viennois, Count of Diois and Valentinois, ruled the Dauphiné as second Dauphin of France (1366)
Charles II of Viennois (1368–1422), also king of France as Charles VI, Dauphin of Viennois, Count of Diois and Valentinois, ruled the dauphiné as third Dauphin of France (1368–1380) and as king of France (1380–1386)
Charles III of Viennois (1386), Dauphin of Viennois, Count of Diois and Valentinois, ruled the dauphiné as fourth Dauphin of France (1386)
Charles IV of Viennois (1392-1401), Dauphin of Viennois, Count of Diois and Valentinois, Duke of Guyenne, ruled the Dauphiné as fifth Dauphin of France (1392–1401)
Louis I of Viennois (1397–1415), Dauphin of Viennois, Count of Diois and Valentinois, Duke of Guyenne, ruled the Dauphiné as sixth Dauphin of France (1401–1415)
John IV of Viennois (1398–1417), Dauphin of Viennois, Count of Diois and Valentinois, Duke of Touraine, ruled the Dauphiné as seventh Dauphin of France (1415–1417)
Charles V of Viennois (1403–1461), also king of France as Charles VII, Dauphin of Viennois, Count of Diois, Valentinois and Ponthieu, ruled the Dauphiné as eighth Dauphin of France (1417–1422) and as king of France/King of Bourges (1422–1423/1429)
Louis II of Viennois[8] (1423–1483), also king of France as Louis XI, Dauphin of Viennois, Count of Diois and Valentinois, ruled the Dauphiné as ninth Dauphin of France (1423/1429–1461) and as king of France (1461–1466)
After the death of Cesar Borgia, the Duchy became a part of the French Royal domain as a part of the Dauphiné. It is now the capital of the Drôme department within the Auvergne-Rhône-Alpes region.
^James R. Briscoe. New Historical Anthology of Music by Women. Volume 1. p. 21. Edited by: James R. Briscoe. Indiana University Press, Bloomignton, IN, USA. ISBN0-253-21683-4
^Catherine Léglu, Rebecca Rist, Claire Taylor. The Cathars and the Albigensian Crusade: Sourcebook. p. 13. Printed by: Routledge, Taylor and Francis Group, London, 2014. ISBN978-0-415-73688-6
^Charity Scott-Stokes, Chris Given-Wilson. "Cantuariensis". The Chronicle of Anonymous of Canterbury. p. 83. Edited and translated by: Charity Scott-Stokes, Chris Given-Wilson. Oxford University Press. ISBN978-0-19-929714-6
^Hastings Rashdall. The Universities of Europe in the Middle Ages: Volume 2, Part 1, Italy ...Incise 14, Valence, Pag, 200. Cambridge Library Collection, Cambridge University Press, 1985. ISBN978-1-108-01811-1