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Male William de Percy Sr. Click to view William de Percy Sr. in the family tree

William de was born on June 24th, 1250 in <Lamberton,Mordington,Berwick,Scotland>.1   William de's father was Walter de Percy Viscount of Lamberton and his mother was Christiana LINDSAY.  His paternal grandparents were Sir. William de Percy Baron and Eleanor de Balliol; his maternal grandmother was Ada Baliol. He had two brothers and two sisters, named Gilbert De, Walter De, Margaret de and Alice de.  He was the second oldest of the five children. He had a half-brother named William de.  He died at the age of 33 on November 6th, 1283.2 


William de's first family with Ada De Baliol

‌William de and Ada De were married in a religious ceremony in June 1266 in <Lamberton,Mordington,Berwick,Scotland>.1   They had a son and a daughter, named William de and Margaret.


William de's second family

‌William de were married in a religious ceremony in June 1266 in <Lamberton,Mordington,Berwick,Scotland>.1 

1 {Larson: Genealogical Research of Kirk Larson}
2 "Genealogical Research of Kirk Larson"
3 {Ancestral File™ v4.19 (FamilySearch®)}
Further sources/citations:
"FamilySearch® Ancestral File™ v4.19", "Pedigree Resource File - CD-Rom" @ Compact Disk #25

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