• Born: Abt 1180, Genf, Geneva, Helvetiz, Switzerland
• Married: May 1195
• Died: 8 Apr 1257, Pierre Châtel, Isere, Rhone-Alpes, France

  Research Notes:

The Chronicle of Alberic de Trois-Fontaines names "Margareta filia domni de Fusceneis de matre Guilelmi, filii Humberti comitis Gebenensis" as wife of "comitis Thome de Sabaudia".... Marguerite is also called Beatrix in later sources. No explanation has been found for these dual names. The fact that "Beatrix" appears in a seal shows that it was not a transcription error. "Thomæ comitis et marchionis…et…Nichola [presumably a transcription error] filia comitis Gebennarum" granted privileges to the citizen of Susa by charter dated 25 Feb 1198. The Complete Peerage refers to unspecified "later writers" who evolved an incorrect theory that Thomas I Comte de Maurienne was married firstly to Béatrix and, after her death without issue, secondly to Marguerite, daughter of Guillaume de Faucigny, who was the mother of his children. The same source confirms that the two names in fact refer to the same person. A charter dated 1224 records an agreement between "Thomæ com. Sabaud" and the bishop of Sion, witnessed by "ipse Thomas comes, Amedeus primogenitus illius, Comitissa uxor Thomæ, eorum quatuor filii clerici…Willelmus, Thomas, Petrus et Bonifacius". "M. comitissa Maurian. uxor Thomæ comitis Maurianensis et marchionis Italiæ" donated property, with the consent of "Thomas com. Maurianæ et filii mei Amedeus et Aymo", by charter dated Dec 1227. "Beatrix uxor comitis Thomæ, Amadeus primogenitus et Aymo filii eius" confirmed the purchase of Chambéry by "Thoma comite" by charter dated 1232, with the seal of "Beatricis comitisse Sabaudie". "Contessa Margarita di Savoia Marchesa in Italia" donated property to "Tomaso suo figlio Conte di Fiandra e d'Hainaut" with the consent of "Conte Amedeo di Savoia suo figlio Primogenito", by charter dated 4 Jan 1244.

The Pingonio Chronicon records the death "VI Id Apr" in 1257 of "Domina Beatrix de Gebennis comitissa Sabaudie et domina de Narembors, parens comitum Sabaudie". ¹