Jean IV Capet-Dreux de Montfort, Duke of Brittany, Earl of Richmond, was born circa 1294 to Arthur II de Bretagne (1262-1312) and Yolande de Montfort (1263-1323) and died 26 September 1345 in Château d'Hennebon of unspecified causes. He married Joanna of Flanders (c1295-1374) March 1329 JL in Chartres. Notable ancestors include Henry II of England (1133-1189), William I of England (1027-1087), Charlemagne (747-814), Hugh Capet (c940-996), Alfred the Great (849-899). Ancestors are from the United Kingdom, France, Germany, Russia, Ukraine, Belgium, England, the Netherlands, Italy, the Byzantine Empire, Sweden.

English sources recognize him as "John IV, Duke of Brittany", while French souces do not, so the English call his son "John V" and the French call him "Jean IV", and so on for further generations.


Offspring of Jean de Montfort and Joanna of Flanders (c1295-1374)
Name Birth Death Joined with
Jean IV de Bretagne (1339-1399) 1339 1 November 1399 Mary of England (1344-1362)
Joan Holland (c1356-1384)
Joanna of Navarre (1370-1437)

Jeanne de Bretagne (1341-1399)

Common ancestors of Jean de Montfort (1294-1345) and Joanna of Flanders (c1295-1374)

  1. Archambaud de Bourbon (1197-1249)
  2. Guy II de Dampierre (1155-1216)
  3. Mathilde I de Bourbon (c1165-1218)
  4. Robert III de Dreux (1185-1234)

Footnotes (including sources)

‡ General
Ω Birth
  • English Wikipedia says "born 1295", while the French says "vers 1294"