See also
1. Emma de Port, daughter of Gilbert de Gaunt ( - ), married William "Algernon" de Percy before 1088.
William "Algernon" de Percy, son of William de Percy ( - ) and Emma de PORT ( - ), was born circa 1040. He was buried in Mount Joy, near Jerusalem. He and Emma de Port had the following children:
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2. William de PERCY, son of William "Algernon" de Percy 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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3. 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:
| 5 | Henry de PERCY (c. 1145-1198). Henry was born circa 1145. He died in 1198. He was buried in Abbey St. Lo, Normandy, France. |
4. 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:
| 6 | Henry de PERCY (c. 1145-1198). Henry was born circa 1145. He died in 1198. He was buried in Abbey St. Lo. |