|Marie of Brittany, Countess of Saint-Pol|
|Noble family||House of Dreux|
|Spouse(s)||Guy IV, Count of Saint-Pol|
|Father||John II, Duke of Brittany|
|Mother||Beatrice of England|
Her sister was Blanche of Brittany, wife to Philip of Artois and mother of Margaret of Artois, Robert III of Artois and Joan of Artois, Countess of Foix. Margaret was mother of Jeanne d'Évreux, Queen of France.
She married Guy IV, Count of Saint-Pol, in 1292, their children were as follows:
- John of Châtillon (d. 1344), Count of Saint Pol
- James of Châtillon (d.s.p. 1365), Lord of Ancre
- Mahaut of Châtillon (1293–1358), married Charles of Valois
- Beatrix of Châtillon, married in 1315 Jean de Dampierre, Lord of Crèvecœur
- Isabeau of Châtillon (d. May 19, 1360), married in May 1311 Guillaume I de Coucy, Lord of Coucy
- Marie of Châtillon, married Aymer de Valence, 2nd Earl of Pembroke
- Eleanor of Châtillon, married Jean III Malet, Lord of Granville
- Joan of Châtillon, married Miles de Noyers, Lord of Maisy
Through her daughter Mahaut, Marie was the maternal grandmother of Marie of Valois, Isabella of Valois, who became Duchess of Bourbon and was the mother of Louis II, Duke of Bourbon, and Joanna of Bourbon, who became Queen of France. Mahaut's other daughter was Blanche of Valois, who married Holy Roman Emperor Charles IV and was the mother of Katharine of Bohemia.
|Ancestors of Marie of Brittany, Countess of Saint-Pol|
- Instructional Images and the Life of St. Eustace, Judith K. Golden, Insights and Interpretations, Ed. Colum Hourihane, (Princeton University Press, 2002), 73.