Genealogy research by Mark Humphrys.
Lambert I, Count of Louvain,
Lambert II, Count of Louvain,
died 1054,
had issue:
Henry II, Count of Louvain,
died 1078,
had issue:
Godfrey I, Count of Louvain,
died 1139,
had natural issue:
Joscelin of Louvain,
mar Agnes de Percy,
adopted the Percy surname,
he died 1180,
had issue:
Henry de Percy,
had issue:
William de Percy, 6th Baron Percy,
died 1245,
had issue:
Henry de Percy, 7th Baron Percy,
mar Alianore de Warenne
[descendant of Charlemagne],
had issue:
Henry Percy, 1st Baron Percy,
born 1273.
First lord of Alnwick Castle,
Northumberland, 1309.
He died 1314.
He had issue:
Henry Percy, 2nd Baron Percy,
born 1301.
He mar Idoine de Clifford
[descendant of Charlemagne].
The Percys acquired Warkworth Castle,
Northumberland,
1332.
He died 1352.
He had issue:
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