See also
1. William de PERCY, son of William "Algernon" de Percy (c. 1040- ) and Emma de Port ( - ), married Alice de Tonbridge. He married Adelaide.
Alice de Tonbridge was the daughter of Gilbert FitzRichard de Tonbridge ( - ). She and William de PERCY had the following children:
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Adelaide was the daughter of Gilbert FitzRichard de Tonbridge ( - ). She and William de PERCY had the following children:
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2. Agnes de Percy, daughter of William de PERCY and Alice de Tonbridge, was born in 1134. She died in 1204. She married Josceline de Louvain of Petworth.
Josceline de Louvain of Petworth was the son of Godfrey Brabatus, Duke of Lothier (1060-1139). He and Agnes de Percy had the following children:
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3. Agnes de Percy, daughter of William de PERCY and Adelaide, married Josceline de Louvain of Petworth.
Josceline de Louvain of Petworth was the son of Godfrey Brabatus, Duke of Lothier (1060-1139). He and Agnes de Percy had the following children:
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4. Henry de PERCY, son of Josceline de Louvain of Petworth and Agnes de Percy, was born circa 1145. He died in 1198. He was buried in Abbey St. Lo, Normandy, France. He married Isabel.
Isabel was the daughter of Adam de Brus, Lord of Skelton ( - ). She and Henry de PERCY had the following children:
| 5 | William de Percy (c. 1193-1245). William was born circa 1193 in Alnwick, Northumberland. He married Eleanor de Baliol circa 1234 in Red Castle, Scotland. He died in 1245. |