Lord Joscelain de Louvain of Petworth
Joscelain was born about 1110 in Louivain, Belgium.  He died in 1180 in Nottinghamshire, England.

 Agnes de Percy
Agnes was born in 1134 in Alnwick, Northumberland, England.  She died before October 13th, 1204 in Petsworth, Sussex, England.

 Maud de Louvain de Percy
Maud was born about 1167 in Petworth, Sussex, England.

 Henry de Percy
He died in 1198.