John III, Duke of Brittany

Duke of Brittany from 1312 to 1341

(Learn how and when to remove this template message)

Isabella of Valois

(m. 1297; died 1309)

Isabella of Castile

(m. 1310; died 1328)

Joan of Savoy

(m. 1329)

HouseDreuxFatherArthur II, Duke of BrittanyMotherMarie, Viscountess of Limoges

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 Arthur II, Duke of Brittany, and his first wife Marie, Viscountess of Limoges.^[1] John was strongly opposed to his father's second marriage to Yolande and attempted to contest its legality.

In 1297, John married Isabella of Valois,^[2] eldest child of Charles, Count of Valois and his first wife Margaret 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 wife Joan of Savoy.^[1] He predeceased his third wife by three years and died childless. He was unwilling to cede the Duchy of Brittany to his half-brother John of Montfort, son of his hated step-mother Yolande. He wished to leave the duchy to the French King Philip VI, 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 of Montfort claimed his rights as duke of Brittany, but King Philip VI 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

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.

References

^ ^a ^b ^c Morvan 2009, table 2.
^ Jones 1988, p. 210.

Sources

Jones, Michael (1988). Creation of Brittany: A Late Medieval State. Hambledon Press.
Morvan, Frederic (2009). La Chevalerie bretonne et la formation de l'armee ducale (in French). Presses Universitaires de Rennes.

External links

Inquisition Post Mortem #355, dated 1341.

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
Preceded by Guy VII	Viscount of Limoges 1312–1331	Succeeded by Joan
Peerage of England
Preceded by John of Brittany	Earl of Richmond 1334–1341	Succeeded by Robert III of Artois

Monarchs of Brittany

Early monarchs

c. 578–907	Waroch Saint Judicael 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 Hoël 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 (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)