Guy de Thouars Duke of Brittany

✓ Guy de Thouars (d. Chemille 23 Apr 1213), son of Geoffroy IV, Vicomte de Thouars, by Aumou; brother of Vicomte Aimery; m. Oct 1199 as her third husband Constance, Duchess of Brittany; father of Alix and Catherine. 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.]