John V, Duke of Brittany (1339 - 1399), son of the former, Duke of Brittany from 1364 to 1399, count of Richemont and count of Montfort (1345-1399).
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Jean de Montfort-Castres (died c. 1300), count of Squillace (kingdom of Naples), son of Philippe II de Montfort, lord of Castres, and of Jeanne de Lévis-Mirepoix
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John IV, Duke of Brittany (1294-1345), contested Duke of Brittany, one of two sides in the Breton War of Succession
Jean de Montfort (died December 1300) was count of Squillace, seigneur of la Ferté-Alais, of Bréthencourt, and of Castres-en-Albigeois from 1270 to 1300.
Jean-Paul Sartre | Jean-Jacques Rousseau | Jean Cocteau | Jean Genet | Jean-Luc Godard | Wyclef Jean | Jean Racine | Jean Chrétien | Jean Michel Jarre | Jean Paul Gaultier | Jean Nouvel | Jean-Michel Basquiat | Jean Giraud | Jean Sibelius | Jean-Luc Ponty | Jean-Baptiste-Camille Corot | Jean-Claude Van Damme | Simon de Montfort, 6th Earl of Leicester | Jean Renoir | Jean-Pierre Rampal | Jean-Léon Gérôme | Jean Harlow | Jean Anouilh | Billie Jean King | Jean Giraudoux | Jean-Bertrand Aristide | Jean Baudrillard | Simon de Montfort | Jean-Pierre Thiollet | Jean-Martin Charcot |
1370-1300 : John of Montfort († 1300), Lord of Castres, Count of Squillace, son of Philip II of Montfort and Jeanne de Levis-Mirepoix.
The Second Breton War of Succession pitted the supporters of two different claimants against one another: those of the half-brother of the deceased John III, Duke of Brittany, Jean de Montfort, who relied on the Estates of Brittany who gathered in Nantes, and those of Charles I, Duke of Brittany, who was supported by King Philippe VI of France and was recognized as Duke of Brittany by the peers of the kingdom.