Please see Darrell Wolcott: The Consorts and Children of Gruffudd ap Llewelyn; http://www.ancientwalesstudies.org/id210.html. (Steven Ferry, July 22, 2020.)

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Nesta of Hereford married Bernard de Neufmarché , Lord of Brecknock, son of Geoffrey de Neufmarché and Ada of Hugleville, before 1104.

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Nesta ferch Gruffydd (born c.1062), married Osbern FitzRichard of Richard's Castle, Shropshire, son of Richard Fitz Scrope, by whom she had issue, including a son, Hugh FitzOsbern who married Eustache de Say, and a daughter Nesta (Agnes) ferch Osbern, who, sometime before 1099, married Bernard de Neufmarche, Lord of Brecon. The Barons de Braose of Abergavenny descend from Sybil of Neufmarche, the daughter of Bernard and Nesta (Agnes), whose own daughter, Bertha of Hereford married William de Braose, Third Lord of Bramber.

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See "My Lines"
( http://homepages.rootsweb.ancestry.com/~cousin/html/p58.htm#i7141 )
from Compiler: R. B. Stewart, Evans, GA ( http://homepages.rootsweb.ancestry.com/~cousin/html/index.htm ) Aka: Nesta fil Trahern, Nest verch Trahearn, Nesta of Hereford, Nesta ap Griffith.

Nest Verch Osborn De Neufmarche is my 30th great grandmother.

Nest verch Osborn VVETERAN
BIRTH 1081
England
DEATH 1163 (aged 81–82)
Wales
BURIAL
Gloucester Cathedral
Gloucester, City of Gloucester, Gloucestershire, England
MEMORIAL ID 233453934

Possibly known as Agnes. Her dowry included Berrington and Little Hereford.

Family Members
Parents
Osbern Fitz Richard
1055–1100
Nest Verch Gruffydd
1059–1153

Spouse
Bernard de Neufmarche
1050–1100

Children
Sibyl Neufmarche Fitz Walter
1100 – unknown
http://opendomesday.org/place/SO3149/eardisley/