William VI, Marquess of Montferrat Italian noble (1173–1226) Parents Elena di Bosco Boniface I, Marquess of Montferrat Children Boniface II, Marquess of Montferrat Alix of Montferrat Dauphine de Saint-Bonnet Beatrice of Montferrat Oddone di Monferrato Siblings Agnes of Montferrat Demetrius of Montferrat Partners Sophie of Hohenstaufen Berta di Clavesana