Ermengarde de Mouci 
Child of Ermengarde de Mouci and William de Dampierre, Seigneur de Dampierre
Beatrix de Montfort, Comtesse de Montfort 
She gained the title of Comtesse de Montfort.
Children of Beatrix de Montfort, Comtesse de Montfort and Robert IV, Comte de Dreux
- Yolande de Dreux+ d. 1323
- Jean II, Comte de Dreux+1 b. c 1265, d. 7 Mar 1309
- [S5792] Robin Dening, “re: Rochfort Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 2 January 2012. Hereinafter cited as “re: Rochfort Family.”
Jean I de Montfort, Comte de Montfort l’Aumari 
He gained the title of Comte de Montfort l’Aumari.
Child of Jean I de Montfort, Comte de Montfort l’Aumari and Jeanne de Châteaudun
- Beatrix de Montfort, Comtesse de Montfort+ d. 9 Mar 1311
Jeanne de Châteaudun 
Child of Jeanne de Châteaudun and Jean I de Montfort, Comte de Montfort l’Aumari
- Beatrix de Montfort, Comtesse de Montfort+ d. 9 Mar 1311
Jean I, Comte de Dreux 
Child of Jean I, Comte de Dreux and Marie de Bourbon
- Robert IV, Comte de Dreux+ b. 1241, d. 1282
Marie de Bourbon 
Child of Marie de Bourbon and Jean I, Comte de Dreux
- Robert IV, Comte de Dreux+ b. 1241, d. 1282
Adela de Ponthie 
Child of Adela de Ponthie and Thomas de Saint-Valéry, Seigneur de Saint-Valéry
- Alianore de Saint-Valéry, Dame de Saint-Valéry+ b. 1192, d. 22 Nov 1251
Jean de Ponthie, Comte de Pontie
Child of Jean de Ponthie, Comte de Pontie
- Adela de Ponthie+ d. 15 Nov 1251
Yolande de Coucy 
Children of Yolande de Coucy and Robert II, Comte de Dreux
- Eleanor de Dreux+2
- Robert III, Comte de Dreux+ b. 1185, d. 3 Mar 1234
- Pierre Mauclerc de Dreux, Duc de Bretagne+ b. c 1187, d. 1250
- Philippe de Dreux+ b. 1192, d. 1242
- [S341] Foundation of Medieval Genealogy, online http://www.fmg.ac. Hereinafter cited as Foundation of Medieval Genealogy.
- [S6690] Capetian-Dreux, “re: Capetian-Dreux Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 4 June 2013. Hereinafter cited as “re: Capetian-Dreux Family.”
Beatrix de Montluco
Children of Beatrix de Montluco and Archambaud VIII de Bourbon, Sire de Bourbon
- Marguerite de Bourbon+ d. 13 Apr 1258
- Marie de Bourbon+ b. 1220, d. 23 Aug 1274
