Béatrix (II) de Bourbourg, abbesse de l'Abbaye Notre Dame de Bourbourg

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13. BEATRIX de Bourbourg . The Historia Comitum Ghisnensium names "Mabilia…Mathildis…Luthgarda…Adelidis…Beatrix" as the five daughters of "Broburgensi castellano Henrico, Deinardi filio" and his wife Beatrix, adding that Beatrix remained unmarried[1318].

https://fmg.ac/Projects/MedLands/NORTHERN%20FRANCE.htm#MabileBourbo...
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She married Arnold I, count of Guines, before March 1200 (Gheldolf, II,
P. 343, P.J., no. Ix). She died in 12I4 (Chron. Drongen, CCF. I, p. 609).
nob. (Chron. Drongen, loc. cit.).
Children: Baldwin (& Mathilda of Fiennes), Robert, Henry, Arnold (« Aelis),
Beatrice, Christina (« Salomon Belle, burgher of Ypres (?)), Mathilda
(* Hugo v, count of Saint-Pol), Adelide, Beatrice (& Anselm In of
Crecques) (see genealogical table GUINES (Lambert of Ardres,
edition de Ménilglaize)).
(Warlop, 704)