On This Day
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Battle of Auray: English forces defeat the French in Brittany

The War of the Breton Succession or Breton Civil War was a conflict between the Counts of Blois and the Montforts of Brittany for control of the Duchy of Brittany, then a fief of the Kingdom of...

The War of the Breton Succession or Breton Civil War was a conflict between the Counts of Blois and the Montforts of Brittany for control of the Duchy of Brittany, then a fief of the Kingdom of France. It was fought between 1341 and 12 April 1365. It is also known as the War of the Two Joans (French: guerre des deux Jeannes) due to the involvement of two rival duchesses of that name, Joan of Flanders and Joan of Penthièvre.

The war formed an integral part of the early Hundred Years' War due to the proxy involvement of the French and English monarchs in the conflict; the French supported the Blois (female heir) whilst the English backed the Montforts (male heir).

Historical Significance

The War of the Breton Succession or Breton Civil War was a conflict between the Counts of Blois and the Montforts of Brittany for control of the Duchy of Brittany, then a fief of the Kingdom of France.

Events Before

  1. A great storm tide in the North Sea destroys the German island of Strand and the city of Rungholt

    Rungholt was a low-lying settlement in North Frisia, in what was then the Danish Duchy of Schleswig. The area today lies in Germany.

  2. Tard-Venus robber bands strike at Brignais, France

    Tard-Venus robber bands strike at Brignais, France

  3. Muhammad VI ruler of Granada killed with a lance personally by Peter I of Castile, along with 36 followers and his head

    Muhammad VI ruler of Granada killed with a lance personally by Peter I of Castile, along with 36 followers and his head sent to Muhammad V (or 27 April)

  4. Beginning of the Battle of Lake Poyang; two Chinese rebel leaders, Chen Youliang and Zhu Yuanzhang, clash in one of the

    Beginning of the Battle of Lake Poyang; two Chinese rebel leaders, Chen Youliang and Zhu Yuanzhang, clash in one of the largest naval battles in history during the Mongol-led Yuan Dynasty

  5. End of the Battle of Lake Poyang; Chinese rebel forces led by Zhu Yuanzhang defeat those of his rival, Chen Youliang, in

    End of the Battle of Lake Poyang; Chinese rebel forces led by Zhu Yuanzhang defeat those of his rival, Chen Youliang, in one of the largest naval battles in history with approximately 850,000 participants

Events After

  1. Isabella of England marries Enguerrand of Coucy at Windsor

    Isabella of England marries Enguerrand of Coucy at Windsor

  2. University of Vienna is founded

    The University of Vienna is a public research university in Vienna, Austria. Founded by Duke Rudolph IV in 1365, it is the oldest university in the German-speaking world and among the largest...

  3. King Frederick III of Siciliy forbids decorations on synagogues

    King Frederick III of Siciliy forbids decorations on synagogues

  4. Comet 55P/1366 U1 (Tempel-Tuttle) approaches within 0.0229 astronomical units of Earth

    Comet 55P/1366 U1 (Tempel-Tuttle) approaches within 0.0229 astronomical units of Earth

  5. Battle of Navarrete: Alliance of King Peter of Castile, Edward the Black Prince and John of Gaunt of England, Aquitaine,

    Battle of Navarrete: Alliance of King Peter of Castile, Edward the Black Prince and John of Gaunt of England, Aquitaine, Majorca and Navarre defeats Count Henry of Castile near Nájera in La Rioja, Castile

More from the 1360s

In a coronation ceremony, Zhu Yuanzhang, aged 40, ascends to the throne of China as the Hongwu Emperor, initiating Ming

In a coronation ceremony, Zhu Yuanzhang, aged 40, ascends to the throne of China as the Hongwu Emperor, initiating Ming Dynasty rule over China that lasts for three centuries

Battle of Navarrete: Alliance of King Peter of Castile, Edward the Black Prince and John of Gaunt of England, Aquitaine,

Battle of Navarrete: Alliance of King Peter of Castile, Edward the Black Prince and John of Gaunt of England, Aquitaine, Majorca and Navarre defeats Count Henry of Castile near Nájera in La Rioja, Castile

Lionel of Antwerp (29), son of Edward III of England marries second wife Violante Visconti (13) in Milan. Attending are

Lionel of Antwerp (29), son of Edward III of England marries second wife Violante Visconti (13) in Milan. Attending are three of Medieval Europe's most famous writers - Geoffrey Chaucer, Jean Froissart and Petrarch

Philip the Bold, Duke of Burgundy marries Margaret 111 Countess of Flanders

Philip the Bold, Duke of Burgundy marries Margaret 111 Countess of Flanders

Frequently Asked Questions

What happened on September 29, 1364?
The War of the Breton Succession or Breton Civil War was a conflict between the Counts of Blois and the Montforts of Brittany for control of the Duchy of Brittany, then a fief of the Kingdom of France. It was fought between 1341 and 12 April 1365. It is also known as the War of the Two Joans (French: guerre des deux Jeannes) due to the involvement of two rival duchesses of that name, Joan of Flanders and Joan of Penthièvre.
Why is Battle of Auray: English forces defeat the French in Brittany significant?
The War of the Breton Succession or Breton Civil War was a conflict between the Counts of Blois and the Montforts of Brittany for control of the Duchy of Brittany, then a fief of the Kingdom of France.

Explore More

September 29 in HistoryYear 1364