BEATRIX de Saint-Omer (-26 Apr 1254). The late 13th century genealogy by Balduinus de Avennis names "Beatrix" as sixth daughter of "castellano Sancti-Audomari domino Wilelmo" and his wife, adding that she married "domino Philippo de Aria, fratri domini Balduini de Aria" and naming their descendants, and in a later passage that she succeeded to the châtellenie de Saint-Omer after the death of her brother Guillaume [VI] without direct heirs[870]. "Willelmus s. Aud. castellanus" set the dowry for his four daughters by charter dated to before 1190, granting an additional third to "Beatrici"[871], which suggests that she was the oldest daughter. This is confirmed by her inheritance of the châtellenie of Saint-Omer after the death of her brother. Dame de la Jumelle 1216. Châtelaine de Saint-Omer et Dame de Fauquemberques. "Beatrix castellana sancti Audomari" donated property to the abbey of Saint-Augustin-lez-Térouane, with the consent of "Mathildis filie mee et heredis nec non et Willermi predicte Mathildis primogeniti filii et heredis", by charter dated Jul 1251[872]."Beatrix castellana S. A., Mathildis domina de Relenghes et heres dicte Beatricis et Willermus de Relenges castellanus sancti Audomari et dominus de Falcoberga" confirmed a sale of property by Guillaume de Danebrueet to Didier de la Porte by charter dated Dec 1251[873]. The obituary of Saint-André-lez-Aire records her death 26 Apr 1254[874]. Her descendants are noted in detail by Giry[875]. An order of parlement dated 1365, relating to a dispute concerning the county of Faucquemberghe and châtellenie of Saint-Omer, records that "Guillelmus comes Falsibergensis et castellanus S. Audomari" had married "quandam filiam comitis tunc Guinarum", by whom he had "filius…Guillelmus et…filia Mathildis", that their son Guillaume had married "filiam domini de Varenis" and had "filia…Alienor" who married "domino de Gaure" by whom she had "Beatrix uxor quondam dicti defensoris [=Roberto domino de Fienlis consanguineo nostro constabulario Franciæ]", and that Mathilde had married "castellano eo tempore de Bellomonte (nomine Balduino) patre Florencii quondam comitis dicti loci patris dicti actoris [=Sansone de Bellomonte milite comite Falsibergensi]"[876]. m (before 1203) PHILIPPE d'Aires, son of --- (-before Mar 1211)