Elle est mariée avec Jean van Brabant.
Ils se sont mariés
Enfant(s):
MARGUERITE de Flandre ([1251]-3 Jul 1285, bur Brussels Franciscan Church). The Genealogia Comitum Flandriæ refers to the three (unnamed) daughters of "Guido…ex Mathilde filia Roberti Tenremontensis", specifying that one (listed first) married "Iohanni duci Brabantie"[695]. The Genealogia Ducum Brabantiæ Ampliata names "Margaretam filiam Guidonis comitis Flandrie" as the second wife of "Iohannes dux Lothoringie et Brabantie"[696]. The Oude Kronik van Brabant records that "Johannes primus…in ducatu Lotharingie et Brabancie" married secondly "Margareta, filia Guidonis comitis Flandrie"[697]. The Annales Blandinienses name "Margaretha duxissa Brabantie, filia Guidonis comitis Flandrie" when recording her death in 1284 and burial in Brussels[698]. Betrothed (Papal dispensation 6 Aug 1266[699]) to PIERRE de Bretagne Seigneur de Dinan, Léon, Hédé, Hennebont et La Roche-Derrien, son of JEAN I Duke of Brittany & his wife Infanta doña Blanca de Navarra [Champagne] (Châteaulin, Finistère 2 Apr 1241-Paris 19 Oct 1268, bur Paris, église des Cordeliers). m (1273) as his second wife, JEAN I “the Victorious” Duke of Brabant, son of HENRI III "le Pacifique/le Débonnaire" Duke of Brabant & his wife Alix de Bourgogne [Capet] (Brussels 1253-Antwerp 3 May 1294, bur Brussels Franciscan Church).
Bronnen
[695] Iohannis de Thielrode Genealogia Comitum Flandriæ MGH SS IX, p. 335.
[696] Genealogia Ducum Brabantiæ Ampliata 14, MGH SS XXV, p. 397.
[697] Oude Kronik van Brabant, p. 68.
[698] Annales Blandinienses 1284, MGH SS V, p. 33.
https://fmg.ac/Projects/MedLands/FLANDERS,%20HAINAUT.htm#Margueritedied1285