Gauthier I de Brienne

✓ Gauthier I, Count of Brienne (d. c.1090), son of Engelbert III and Petronille (genealogy of c.1100: 'ex Ingelberto Walterius comes de Brena'; charter of 28 Dec 1035 'Comes Breonensium Gualterus cum matre sua Petronilla'); m. Eustachie of Tonnerre, Countess of Bar-sur-Seine. Father of Erard I (Erard's charter for gifts of 'pater meus Walterius comes') and Milo, Count of Bar-sur-Seine. Source: Medieval Lands (fmg.ac, Cawley), 'Champagne - Brienne (chambrien)'. [DIRECT ANCESTOR OF THE COMPILER: flag added 22 Oct 2026 by walking the tree from Aynsley, so that this marker is reliable and can be searched.]