Ermentrude de Roucy (c. 951 – 5 May 1005) (Irmtrude) was a Countess and Duchess of Burgundy.
Ermentrude was a daughter of Renaud of Roucy and his wife, Alberade of Lorraine, daughter of Gilbert, Duke of Lorraine.
By 971, Ermentrude married Aubry II of Mâcon and thus became a countess of Mâcon. They had: Létaud, archbishop of Besançon; Aubry, abbot of Saint-Paul de Besançon; Béatrice de Mâcon (d.1030), who was married in 975 to Count Geoffrey I of Gâtinais, and afterwards to the Count Hugues du Perche; Perhaps a daughter, N de Mâcon, the putative spouse of Eble de Poitiers, son of William IV of Aquitaine and Emma of Blois; they were possibly the parents of Ebles I of Roucy and all of his siblings, including Yvette de Roucy, the wife of either Manasses II or Manasses III of Rethel.
Ermentrude also married Otto-William, Count of Burgundy. They had: Guy I of Mâcon Matilda, married Landri of Nevers Gerberga, married William II of Provence Reginald I, Count of Burgundy Agnes of Burgundy, Duchess of Aquitaine, married William V of Aquitaine
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