[2] According to several French historians, Constance died after giving birth to Alix's sisters Catherine and Margaret.

The Breton barons recognized Alix as Duchess of Brittany after the presumed death of Arthur, instead of Eleanor.

This was due to fears that John might claim to rule Brittany as regent for the imprisoned Eleanor.

Peter married Alix on 27 January 1213, and paid homage to the French king for Brittany.

Alix and Peter had: Alix of Thouars is the heroine of the novel Le Poids d’une couronne (légende bretonne) (1867–1868) by Gabrielle d’Étampes and is mentioned in the novel Dans l’Ombre du Passé (2020) by Léa Chaillou, where it is revealed that the heroine is named after her.