In 1364, following the death of
John II of France, the County of Tancarville was separated from the County of Longueville, while the city of
Montivilliers was attached to the
royal demesne. In 1505, the
barony of Auffay was united to the county and subsequently, the
Duchy of Longueville was created by King
Louis XII of France for his first cousin once removed François d'Orléans, Count of Dunois, son of François d'Orléans, Count of Dunois, son of
Jean d'Orléans, himself an illegitimate son of the
Duke of Orléans. The title became extinct in 1694 following the death of
Marie de Nemours. From 1648, Longueville was also
Sovereign Prince of Neuchâtel, a Swiss territory. In 1654 the eighth duke was created a peer as
Duke of Coulommiers but the peerage was never registered and so became extinct at his death.
Bertrand du Guesclin (1320–13 July 1380), constable of France and Castile, Count of Longueville from 1364 Chamberlain, France, Pontorson captain, captain of Mount St. Michael, king of Granada, Duke of Molina.
Jean de Dunois (23 November 1402 – 24 November 1468), a French captain during the Hundred Years' War, comrade in arms of
Joan of Arc, Count of Dunois, Count of Longueville from 1443, Baron de Gex, lord of Parthenay of Valbonais, Claix,
Grand Chamberlain of France, President of the Council of Thirty-Six.
^Powicke Maurice The Loss of Normandy, 1189-1204. Studies in the History of the Angevin Empire, Manchester University Press, 1913 (1960 edition), p {{.}} 344.
^
abDavid Crouch, "Marshal, William (I), fourth earl of Pembroke (c.1146-1219)", Oxford Dictionary of National Biography, Oxford University Press, publishing Online, May 2007.
^ Ibid., p. 304, n. 111, after
T. Stapleton (ed.), Magni rotuli Scaccarii Normannie t. II, p. cxxxviiii sharing and confirmation in 1200 by John Lackland, see Thomas D. Hardy, Rotuli chartarum in Turri Londinensi asservati, London, 1835, p. 47.
^Powicke Maurice The Loss of Normandy, 1189-1204. Studies in the History of the Angevin Empire, Manchester University Press, 1913 (1960 edition), p {{.}} 260, after: L. Delisle (ed.) Norman Cartulary Philip Augustus, Louis VIII, St. Louis and Philip the Hardy, Caen, 1882 (rééd. Geneva Mégariotis Reprints, 1978), p {{.}} 14 n 74 (Act of 1204,
Arch. nat. in box J 399).
^L. Delisle (ed.) Norman Cartulary Philip Augustus, Louis VIII, St. Louis and Philip the Hardy, Caen, 1882 (rééd. Geneva Mégariotis Reprints, 1978), p {{.}} N 304 ° 1120 (Act of July 1219,
Arch. nat. in box J 387).
^D. J. Power, "Marshal, Richard, sixth earl of Pembroke (d. 1234)", Oxford Dictionary of National Biography, Oxford University Press, 2004.