- Born: , , France
- Marriage: Guillaume I DE DAMPIERRE, Seigneur De Dampierre, De Saint-Dizier, De Moesl 
- Died: After Jul 1190, , , France
Sources, Comments and Notes:
GUILLAUME [I] de Dampierre, son of GUY [I] Seigneur de Dampierre & his wife Helvide de Baudémont (-before 1161). ...
m [as her first husband, ERMENGARDE, daughter of --- (-after [Jul] 1190). Her first marriage is indicated by the charter dated Feb 1211 (O.S.) under which "Gui de Dampierre frère dudit Dreu" guaranteed the loyalty of "Dreu de Mello le jeune". It is also suggested by the charter dated 1172 under which "Drogo de Melloto et Ermengardis uxor mea" founded Vieupou priory, with the consent of "domini Guidonis de Dampetra et domini Milonis fratris sui et Guillelmi filii nostri". She married [secondly] (before 1172) as his second wife, Dreux [I] de Mello . "Drogo de Merloto" donated property from "Mintriaci" Nitry, canton Noyers, arr. Tonnerre, Yonne to La Charité-sur-Loire, for the soul of "fratris mei Roberti et Vuillelmi ibidem sepultorum", with the consent of "domino Vuillelmo de Merloto…et uxore mea Ermengardi", by charter dated 1177. "Droco de Merlo" donated vines "apud Irenci" to Pontigny, with the consent of "uxoris mee Ermenjardis...et filii mei Guillelmi", by charter dated [Jul] 1190.]
Guillaume [I] & his wife had five children:
1. GUY [II] de Dampierre (-18 Jan 1216). ...
3. HELVIDE (-1224 or after, bur Vaucelles)
5. ODETTE (-1212)."
Ermengarde married Guillaume I DE DAMPIERRE, Seigneur De Dampierre, De Saint-Dizier, De Moesl  [MRIN: 1864]. (Guillaume I DE DAMPIERRE, Seigneur De Dampierre, De Saint-Dizier, De Moesl  was born in , , France and died before 1161 in , , France.)