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He dropped the name du Bois and used de Fiennes. Charles is shown on page 390 of DICTIONNAIRE DE LA NOBLESSE as Seigneur de Vermeille. Charles was also Seigneur d'Annequin and Comte de Chaumont, Vicomte de Fruges, Barin d'Eulle and Seigneur d'Esquerdes. He received his titles from his older half-brother, Jean IV.