Montisbeligardis comitissa" donated property to the abbey of Grce-Dieu, for the soul of "mariti sui Amedei comitis Bellisgardis", with the consent of "filie sue Ludovica et Grossa", by charter dated 1195 ([1150/55]-23 Oct ----, after 1186).
The primary source which confirms her parentage has not yet been identified.
No primary source has yet been traced which confirms whether Marguerite was the wife of Thibaut [III] or of Richard.
Her birth date range is estimated from the birth of her fourth son which is estimated to [1170/75].
This in turn suggests that she was not born from the same marriage as her brother Richard [III].
He arrived in Palestine [before 1205] and was appointed Constable of the kingdom of Jerusalem by King Amaury II in 1205.
In 1207, he lifted the Seljuk siege of Satalia [Antalya] in southern Asia minor in response to the call of its ruler Aldobrandino, but was himself expelled presumably after attempting to take the town for himself.