Alix of Thouars
| Alix | |
|---|---|
 |
|
| Duchess of Brittany | |
| Reign | April 1203 – 21 October 1221 |
| Predecessor | Arthur I |
| Successor | John I |
| Co-ruler | Peter I (as Duke jure uxoris) |
| Born |
1200 Brittany |
| Died | 21 October 1221 |
| Burial | 24 November 1225 Villeneuve Abbey, Nantes |
| 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 |
| Religion | Roman Catholicism |
Alix of Thouars (1200 – 21 October 1221) (in Breton Alis) was hereditary Duchess of Brittany and 5th Countess of Richmond from 1203 to her death.
Alix was born in 1200. She was the daughter of Constance, Duchess of Brittany and Guy of Thouars. According to several French historians, Constance died after giving birth to Alix's sisters Catherine and Margaret. 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. Alix's father Guy became regent for Alix until 1206, when Philip II of France made himself the regent of the duchy in Alix’s name. King Philip II broke off the betrothal of Alix and the Breton prince Henry of Penthièvre, and turned to his French cousin Peter of Dreux, as Alix's husband. Pierre married Alix on 27 January 1213, and paid homage to the French king for Brittany.
In 1218 Pierre and Alix were recognized by William Marshal, 1st Earl of Pembroke regent of England as Earl and Countess of Richmond in place of Eleanor, who would never be released from imprisonment.
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