public profile
Daughter of Nele (Nigel) de Monville, Lord of Folkestone and Emma de Monville Wife of Rualon d'Avranches, Lord of Folkestone Half sister of Sibylle Rose Comtesse de Guînes
See p. 220 of https://books.google.com/books?id=mcJeAAAAcAAJ&lpg=PA220&ots=q2aQLVX0pH&dq=rualon%20de%20abrincis%20d'avranches&pg=PA538#v=onepage&q=rualon%20de%20abrincis%20d'avranches&f=false