John III, Duke of Brittany

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 and Joanna with Charles I

Born	8 March 1286 Château de Champtoceaux
Died	30 April 1341(1341-04-30) (aged 55) Caen
Burial	Notre-Dame des Carmes
Spouse	Isabella of Valois Isabella of Castile Joan of Savoy
House	House of Dreux
Father	Arthur II, Duke of Brittany
Mother	Marie, Viscountess of Limoges
Religion	Roman Catholicism

John III the Good (in Breton Yann III, in French Jean III; 8 March 1286 – 30 April 1341) was duke of Brittany, from 1312 to his death and 5th Earl of Richmond from 1334 to his death. He was the son of Duke Arthur II and Mary of Limoges, his first wife. John was strongly opposed to his father's second marriage to Yolande of Dreux, Queen of Scotland and attempted to contest its legality.

In 1297, John was married to his first wife Isabella of Valois, eldest daughter of Charles of Valois and his first wife Margaret of Naples. At the time of their marriage John was eleven years old and his bride five. Isabella died childless in 1309. In 1310, John married his second wife, Isabella of Castile. Isabella died childless in 1328.

In 1329, John married his third wife, Joan of Savoy. He predeceased his third wife by three years and died childless. He was unwilling to cede the Duchy to his half-brother, John of Montfort, son of his hated step-mother Yolande. He wished to leave the Duchy to the French king, but his nobles objected. The marriage of his niece Joanna of Dreux to Charles of Blois gave Charles a plausible claim to the Duchy, but the matter was unresolved at John's death.

After his death, John de Montfort claimed his rights as duke, but the French king supported the Blois faction, and the Breton War of Succession (1341–1364) was triggered. The Breton Civil War was fought between the House of Blois and the House of Montfort. It became part of the Hundred Years' War, as England supported the Montfort faction, which won, against the House of Blois, which was supported by France.

Arms

widths="200px"
Coat of arms as duke until 1316
In 1316, he simplified his coat of arms to plain ermine. This is still the arms of Brittany.

Regnal titles
John III, Duke of Brittany House of Dreux Cadet branch of the Capetian Dynasty Born: 8 March 1286 Died: 30 April 1341
Preceded by Arthur II	Duke of Brittany 1312–1341	Succeeded by Joan with Charles
Preceded by Arthur II	Viscount of Limoges 1312–1331	Succeeded by Joan with Charles
Peerage of England
Preceded by John of Brittany	Earl of Richmond 1334–1341	Succeeded by Robert III of Artois

Rulers of Brittany

Early monarchs

c. 578–907	Waroch Saint Judicaël Alain II Hir Morman Wihomarc Nominoe Erispoe Salomon Pascweten Gurvand Judicael Alan I Gourmaëlon

Viking Occupation

c. 907–938	Hroflr Rognvaldr Incon

House of Nantes

938–958	Alan II (938–952) Drogo (952–958) Hoël I (960–981) Guerech (981–988) Alan (III) (988–990)

House of Rennes

958–1072	Conan I (990–992)) Geoffrey I (992–1008) Alan III (1008–1040) Odo I (1008–1034) Conan II (1040–1066) Hawise (1066–1072) with Hoel II (1066–1072)

House of Cornouaille

1072–1156	Alan IV (1072–1112) Conan III (1112–1148) Bertha (1148–1156) with Odo II (1148–1156)

House of Penthièvre

1156–1196	Conan IV (1156–1166) Constance (1166–1201) with Geoffrey II (1181–1186), later Guy of Thouars (1199–1201)

House of Plantagenet

1196–1203	Arthur I (1196–1203)

House of Thouars

1203–1221	Alix (1203–1221) with Peter I (1213–1221)

House of Dreux

1221–1341	John I (1221–1286) John II (1286–1305) Arthur II (1305–1312) John III (1312–1341)

War of the Breton Succession

1341–1365	Joan (1341–1364) with Charles I (1341–1364) disputed by John of Montfort (1341–1345) and John IV (1345–1365)

Montfort of Brittany

1365–1514	John IV (1365–1399) John V (1399–1442) Francis I (1442–1450) Peter II (1450–1457) Arthur III (1457–1458) Francis II (1458–1488) Anne (1488–1514)

House of Valois

1514–1547	Claude (1514–1524) Francis III (1524–1536) Henry (1536–1547)

Courtesy title

1547–present	Louis de France (1704–1705) Louis de France (1707–1712) Francis de Bourbon (1973–1984)

Authority control	WorldCat Identities VIAF: 15126708 GND: 100947743

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John III, Duke of Brittany

Arms

See also