Margaret d'Eu Peerage person ID=120101 Parents Jeanne, Countess of Guînes John I of Brienne, Count of Eu John II of Brienne, Count of Eu Béatrice de Châtillon Alphonso of Brienne Children John I of Thouars Marguerite de Thouars Hugh II of Thouars Siblings Raoul I of Brienne, Count of Eu Marguerite Jeanne de Brienne Isabeau de Brienne Margaret de Brienne Maud de Brienne Raoul d'Eu Blanche d'Eu Partners Guy II de Thouars