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Male Piers (Peter) De Grandison Click to view Piers (Peter) De Grandison in the family tree

Piers (Peter) De was born in 1287 in Of, Ashperton, Herefordshire, England.1   Piers (Peter) De's father was William De Grandison and his mother was Sybil Tregoz.  His paternal grandmother was Agnes De Neuchatel; his maternal grandparents were John De Tregoz and Mabel Fitzwarin. He had a brother and three sisters, named John, Agnes, Mabilia De and Katherine De.  He was the oldest of the five children.  He died at the age of 71 on August 10th, 1358 in England.1 

Family Details of Piers (Peter) De's family with Blanche De Mortimer

1 phelps1609.FTW
Further source/citation:
World Family Tree Vol. 16, Ed. 1 @ Tree #1609