Alix, Duchess of Brittany

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Duchess of Brittany
Reign April 1203 – 21 October 1221
Predecessor Arthur I
Successor John I
Co-ruler Peter I (as Duke jure uxoris)
Spouse Peter I
Issue John I, Duke of Brittany
Yolande, Countess of Penthièvre
House House of Thouars
Father Guy of Thouars
Mother Constance, Duchess of Brittany
Born (1201-09-05)5 September 1201
Died 21 October 1221(1221-10-21) (aged 20)
Burial 24 November 1225
Villeneuve Abbey, Nantes
Religion Roman Catholicism

Alix of Thouars (5 September 1201 – 21 October 1221) (in Breton Alis) was the hereditary Duchess of Brittany from 1203 to her death.[1]


Alix was born on or shortly before 5 September 1201. She was the daughter of Constance, Duchess of Brittany[2] and Guy of Thouars.[3] Constance died after giving birth to Alix and her sister Catherine. Alix's older half-brother was Arthur I, Duke of Brittany and her half-sister was Eleanor, Fair Maid of Brittany, the children of Constance and Geoffrey Plantagenet. Upon the death of Richard I of England, a power struggle commenced between her half-brother Arthur and John, King of England. At the Battle of Mirebeau in 1202, Arthur and Eleanor were captured. Arthur was imprisoned at the Château de Falaise and in 1203 disappeared. Eleanor was imprisoned at Corfe Castle.

The Breton barons recognized Alix as Duchess of Brittany after the death of Arthur, instead of Eleanor. This was due to fears that John might claim to rule Brittany as regent for the imprisoned Eleanor. Her father Guy became regent for Alix until 1206, when Philip II of France made himself the regent of the duchy in Alix’s name.

In 1213, the French King, Philip II, arranged her marriage to his cousin Peter of Dreux,[4] who in turn swore fealty to Philip.[5] Alix died in childbirth, without having exercised much control over her own inheritance. She was succeeded in the duchy by her son John I, but Peter remained the de facto ruler of Brittany until 1237. Alix had two surviving children.


  1. John I, Duke of Brittany[6]
  2. Yolande of Brittany
  3. Arthur of Brittany (1220–1224)



  1. ^ Chronicon Britannicum
  2. ^ Genealogia Comitum Richemundiæ
  3. ^ Alix's family
  4. ^ Chronique de Guillaume de Nangis
  5. ^ Brittany, Julia M.H. Smith, Medieval France: An Encyclopedia, Ed. William W. Kibler, (Garland Publishing Inc., 1995 ), 148.
  6. ^ Chronicon Ruyensis Cœnobii

See also[edit]

Alix, Duchess of Brittany
Born: 5 September 1201 Died: 21 October 1221
Regnal titles
Preceded by
Arthur I
Duchess of Brittany
with Peter (1213–1221)
Succeeded by
John I