William De Percy
William was born in 1112 in Alnwick, , Northumberland, England.  He died at the age of 56 in 1168.  He was buried in 1168.

 Adela (Alice) De Clare
Adela (Alice) was born about 1115 in Tunbridge, , Kent, England.

 Agnes De Percy
Agnes was born in 1134 in Alnwick, , Northumberland, England.  She died at the age of 71 in 1205 in , , , England.  She was buried in 1205 in , , , England.