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  2. John IV the Conqueror KG (in Breton Yann IV, in French Jean IV, and traditionally in English sources both John of Montfort and John V) (1339 – 1 November 1399), was Duke of Brittany and Count of Montfort from 1345 until his death and 7th Earl of Richmond from 1372 until his death.

    • John of Montfort

      John of Montfort (Middle Breton: Yann Moñforzh, French: Jean...

  3. Mar 15, 2024 · Role In: War of the Breton Succession. John (IV) (died 1345) was a claimant to the duchy of Brittany upon the death of his childless half brother, John III. He was the only surviving son of Arthur II.

    • The Editors of Encyclopaedia Britannica
  4. Nov 13, 2016 · John was recognised as John IV duke of Brittany by Charles V of France, to whom he performed homage for his duchy in December 1366. Initially, as duke of Brittany, John’s ties to England continued to be strong, his financial debts and other obligations ensuring this. In 1366 he married Joan Holland, step-daughter of Edward, the Black Prince.

  5. John V (or VI) (born Dec. 24, 1389—died Aug. 28, 1442) was the duke of Brittany from 1399, whose clever reversals in the Hundred Years’ War and in French domestic conflicts served to strengthen his duchy. John was on good terms with Philip the Bold, duke of Burgundy, who was his guardian.

  6. 3 days ago · John I, the Red (son) 1286–1305. John II (son; made duke of Brittany by Philip IV of France 1297) 1305–1312. Arthur II (son) 1312–1341. John III, the Good (son) 1341–1345. John (brother; count of Montfort) 1341–1364. Charles of Blois (married Joan, niece of John III; rival claimant; war of the Breton Succession 1341–64) 1364–1399

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