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| John III | |
|---|---|
 The funeral of John III | |
| Duke of Brittany | |
| Reign | 27 August 1312 – 30 April 1341 |
| Predecessor | Arthur II |
| Successor | disputed between:John of Montfort andJoanna withCharles I |
| Born | 8 March 1286 Château de Champtoceaux |
| Died | 30 April 1341(1341-04-30) (aged 55) Caen |
| Burial | Notre-Dame des Carmes |
| Spouses | |
| House | Dreux |
| Father | Arthur II, Duke of Brittany |
| Mother | Marie, Viscountess of Limoges |
John IIIthe Good (inBretonYann III, inFrenchJean III; 8 March 1286 – 30 April 1341) wasDuke of Brittany, from 1312 to his death and 5thEarl of Richmond from 1334 to his death. He was the son ofArthur II, Duke of Brittany, and his first wife Marie, Viscountess of Limoges.[1] John was strongly opposed to his father's second marriage toYolande and attempted to contest its legality.
In 1297, John married Isabella of Valois,[2] eldest child ofCharles, Count of Valois and his first wifeMargaret of Naples. At the time of their marriage John was eleven years old and his bride five. She died childless in 1309.
In 1310, John married his second wife,Isabella of Castile.[1] She died childless in 1328.
In 1329, John married his third wifeJoan of Savoy.[1] He predeceased his third wife by three years and died childless. He was unwilling to cede theDuchy of Brittany to his half-brotherJohn of Montfort, son of his hated step-mother Yolande. He wished to leave the duchy to the FrenchKing Philip VI, but his nobles objected. The marriage of his nieceJoanna of Dreux toCharles of Blois gave Charles a plausible claim to the duchy, but the matter was unresolved at John's death.
After his death, John of Montfort claimed his rights as duke of Brittany, but King Philip VI supported the Blois faction, and theBreton War of Succession (1341–1364) was triggered. The Breton Civil War was fought between theHouse of Blois and theHouse of Montfort. It became part of theHundred Years' War, as England supported the Montfort faction, which won, against the House of Blois, which was supported by France.
John III, Duke of Brittany Cadet branch of theCapetian dynasty Born: 8 March 1286 Died: 30 April 1341 | ||
| Regnal titles | ||
|---|---|---|
| Preceded by | Duke of Brittany 1312–1341 | Succeeded by |
| Preceded by | Viscount of Limoges 1312–1331 | |
| Peerage of England | ||
| Preceded by | Earl of Richmond 1334–1341 | Succeeded by |
| International | |
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| People | |
| Other | |
