Isabeau de Brienne Peerage person ID=709089 (b. 1270) Parents John I of Brienne, Count of Eu Béatrice de Châtillon Alphonso of Brienne Children Jeanne of Flanders-Dampierre, Dame de Moeslain Marguerite de Dampierre, Dame de Dampierre-sur-Aube et de Sompuis Siblings Jeanne de Brienne Margaret de Brienne Maud de Brienne Margaret d'Eu John II of Brienne, Count of Eu Raoul d'Eu Blanche d'Eu Partners John II of Dampierre