Alix de Thouars Duchess of Brittany

✓ Alix de Thouars, Duchess of Brittany ([1200]-21 Oct 1221), da. of Guy de Thouars by Duchess Constance (Genealogia Comitum Richemundiae: 'Adelicia', daughter of 'Constantia filia Conani' and 'Guidoni de Thoarcio', married 'domno Petro Mauclerc'); m. [1213/14] Pierre de Dreux (Mauclerc); mother of Jean I, Duke of Brittany, Yolande (Countess of La Marche) and Arthur. Source: Medieval Lands (fmg.ac, Cawley), read 2 Nov 2026: 'Brittany Dukes'. [DIRECT ANCESTOR OF THE COMPILER: flag added 2 Nov 2026 by walking the tree from Aynsley, so that this marker is reliable and can be searched.]