Beatrijs van Strijen

i) RASO [XII] van Gavre ([1235/45]-23 Nov [1307]). The late 13th century genealogy by Balduinus de Avennis records that "filiarum…domini Sigeri…secundam" married "dominus de Liedekerke, dominus Rasso de Gavre" and records that they had several children "quorum primogenitus Rasso" who married "filiam Henrici de Boulers juxta Grammont"[621]. Heer van Liedekerke. Heer van Breda. "Rasso dictus de Gavera dominus de Lidekerka miles et Margareta uxor mea…Rasso primogenitus filius dictorum Rassonis domini de Lidekerka et Margaretæ uxoris eiusdem dominus de Bouler miles" ratified an agreement with Ninove, with the consent of "Arnulpho dicto de Ympenghem militi fratri nostro et Margaretæ uxori suæ…Sophia dicti Arnulphi filia quam de priori uxore sua susceperat cum marito suo Scalkino", by charter dated Mar 1267[664]. Heer van Boelare, de iure uxoris: “Gérars cevaliers sires de Sothenghien” declared holding “me maison de Sotenghien” in fief from Jean d’Avesnes Comte de Hainaut, appointing “mes chiers cousins Rasson de Liedekerke signeur de Boulers, Sohier de Brayne signeur de Lisseruoeles, chevaliers” as guarantors, by charter dated 1286[665]. Heer van Breda: “Razo de Gavere dominus de Liedekercke et de Breda et Alicia uxor mea” donated property to "monasterii Ninivensis" by charter dated 1292[666]. "Raso de Gavera dominus de Liedekercke et de Breda et Rasso de Liedekercke miles dominus de Boulaer eius primogenitus" donated property to Tongerloo abbey by charter dated 1294[667]. "Raso de Gavre dominus de Liedekercke et de Breda" transferred the hospital of Breda to convent of St Katharina at Woude by charter dated 1 Nov 1295[668]. “Johannes dictus Van den Eyghen filius quondam...domini Rasonis pie memorie domini de Lidekerke et de Breda miles et Aleydis eius uxor” donated “terra...parochiarum de Ekerni de sancti Jacobi de Hoghescoten” to the abbey of Saint-Bernard sur l’Escaut, in the presence of “domini Rasonis de Gavere, domini de Lydekerke et de Breda et domini Sygeri de Lyderkerka domini de Beaufort et de Crutbeke...germanorum mei”, by charter dated 8 Sep 1296[669]. The testament of “Rase van Gavre heer van Liedekerke ende van Breda”, dated 23 Jun 1300, with the consent of “mynen outsten sone Raesen die heer is van Boulair”, bequeathed dower to “mynen...wyve ver Adewynen die dochter was eens edel mans heer Willems die wylen heer was van Stryene”, sealed by “Jan van Liedekercke heer van Eyghem broeder des heeren van Liedekercke voorseyd...”[670]. https://fmg.ac/Projects/MedLands/FLEMISH%20NOBILITY.htm#_Toc103320081
m firstly (before Mar 1267) ALIX van Boelare, daughter of HENDRIK Heer van Boelare & his wife --- (-25 Nov 1294, bur Beaupré). The late 13th century genealogy by Balduinus de Avennis records that "filiarum…domini Sigeri…secundam" married "dominus de Liedekerke, dominus Rasso de Gavre" and records that they had several children "quorum primogenitus Rasso" who married "filiam Henrici de Boulers juxta Grammont"[671]. “Razo de Gavere dominus de Liedekercke et de Breda et Alicia uxor mea” donated property to "monasterii Ninivensis" by charter dated 1292[672]. An epitaph at Beaupré records the burial of “medame Aelys de Boulers ky fut feme au S. de Liedekercke et de Breda” who died 25 Nov 1294[673]. https://fmg.ac/Projects/MedLands/FLEMISH%20NOBILITY.htm#_Toc103320081
m secondly ([11 Feb 1296/23 Jun 1300]) HADEWIJN van Strijen, daughter of WILLEM [IV] Heer van Strijen & his wife --- (-before 1313). "Nyclaes van Putte" confirmed the inheritance of “Hadewyen miins wiifs zuster Aleyden” from “hoir vader miin here Willem van Stryene ende hoir moeder” by charter dated 25 Nov 1290[674]. "Aleit van Putte...htmhter heren Willems van Striene...wiif Niclaus van Putte" granted “tiende...in Vorensaterwart...” to “Hadewien van Striene mire zuster” by charter dated 11 Feb 1296[675]. The testament of “Rase van Gavre heer van Liedekerke ende van Breda”, dated 23 Jun 1300, with the consent of “mynen outsten sone Raesen die heer is van Boulair”, bequeathed dower to “mynen...wyve ver Adewynen die dochter was eens edel mans heer Willems die wylen heer was van Stryene”, sealed by “Jan van Liedekercke heer van Eyghem broeder des heeren van Liedekercke voorseyd...”[676].
https://fmg.ac/Projects/MedLands/FLEMISH%20NOBILITY.htm#_Toc103320081

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Marriage 02/1273 seems unlikely. 02/1273 could be her death date.

Secondary sources variously give her parents as:

1. Willem III van Strijen and his wife ... van Randerode
2. Aubert II de Longueval and his wife Anne de Melun

Dating makes it unlikely she was a van Stijen. The problem was summarized in 1999 at soc.genealogy.medieval.