Henry de PERCY
Henry de was born about 1159 in Alnwick, Northumberland, England.  He died in 1196.

 Isabel de BRUS
Isabel de was born about 1150 in Skelton, Yorkshire, England.  She died after 1230.

 William de PERCY
William de was born in 1183 in Alnwick, Northumberland, England.  He died at the age of 62 in 1245.