Petronilla De Grendmesnil 
Petronilla was born in 1134. Petronilla's father was Hugh De Grentmesnil II Lord Grentmesnil and her mother was Adelhyde De Gaunt. She was an only child. She died at the age of 78 in 1212.General Notes
De Grentmaisnil, De Beaumont, De Vere, Devereux Sources:
Clutterbuck's History and Antiquities of Hertfordshire, England.
Charts showing the descent of the owners of the Manor of Ware,
from the time of William, the Conqueror, Vol. 3, pp. 287-90.
Browning's Col. Dames of Royal Descent, p. 227.
David Starr Jordan's "Your Family Tree", p. .....
Browning's Magna Charta Barons, p. .....
Burke's Dormant and Extinct Peerage, p. .....
Mellville's Ancestry of John Whitney.
National Society Daughters of Barons of Runnemede. Register, pp. 183, 385.
They had a son and three daughters, named Robert FitzParnell De Harcourt Earl Of, Hawise, Amice and Margaret.
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Children
Amice De Beaumont
Amice was born in 1152 in Leicester, Leicestershire, England. She died at the age of 63 on September 3rd, 1215.
Margaret De Beaumont
Margaret was born in 1154 in Leicester, Leicestershire, England. She died at the age of 80 in 1234.
Robert FitzParnell De Harcourt Earl Of Leicester
Robert FitzParnell De Harcourt Earl Of was born in 1155.
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