John III, Duke of Brittany
|
|
John III of Dreux (in French Jean III de Dreux) (March 8 1286 - April 30 1341), known as the Good, was duke of Brittany, from 1312 to his death. He was son of Duke Arthur II and Mary of Limoges, his first wife.
John married three times but died with no male heirs. He married firstly, in 1298, Isabelle, sister of Philip IV of France; secondly, in 1310, Isabella, daughter of Sancho IV of Castile; and thirdly, in 1329, Joan, only child of Edward of Savoy. His death triggered the Breton War of Succession (1341-1364), which opposed the House of Blois and the rights of his niece Joanna of Dreux, to the House of Monfort, a cadet branch of the ducal family of Brittany, lead by John of Montfort and his homonymous son. This civil war was an incident of the Hundred Years War.
See also: Dukes of Brittany family tree
| Preceded by: Arthur II | Duke of Brittany | Succeeded by: John IV or Joanna and Charles |