269007907Margareta is known from basically just one record, in which she's described as the daughter of 538015814Eudes and 538015815Rohesia.1
The same record states that she married 269007906William de Mandeville.1
Two reputable sources (noted below) state that after 269007906William's death, 269007907Margareta re-married to Other Fitz Count.*
269007907Margareta is mentioned in:
(1)
Douglas Richardson, Royal Ancestry: A Study in Colonial and Medieval Families, 2nd edition, (Salt Lake City, Utah, 2013), volume IV, page 560; and
(2)
K. S. B. Keats-Rohan, Domesday Descendants: A Prosopography of Persons Occurring in English Documents 1066-1166: II, Pipe Rolls to Cartae Baronum (The Boydell Press, 2002), page 845.
Footnotes:
*
The marriage can be deduced from another phrase in the same Monastic Anglicanum record cited below (i.e., source citation #1), which reads, "Willelmo filio Otvel fratri ejusdem Comitis Gaufredi," 1 where "Comitis Gaufredi" is the brother of 269007907Margareta's daughter 134503953Beatrice.
Sources Cited:
1: Sir William Dugdale, Monasticon Anglicanum [...], Volume V, page 269, number III