Alphonso of Brienne Count of Eu (1227–1270) Parents Berengaria of León John of Brienne Children Isabeau de Brienne Blanche d'Eu Raoul d'Eu John I of Brienne, Count of Eu Margaret d'Eu Siblings John II of Brienne Marie of Brienne Isabella II of Jerusalem Louis of Brienne Partners Marie of Lusignan, Countess of Eu