Henry De Percy
Henry was born in Alnwick, Northumberland, England.

 Idonea de Clifford
Idonea was born about 1303 in Clifford Castle, Clifford, Herefordshire, England.  She died on August 24th, 1365.

 Isabel De Percy
Isabel was born about 1327 in Alnwick, Northumberland, England.  She died on May 25th, 1368.

 Maud De Percy
Maud was born in 1335 in Warkworth Castle, Alnwich, Northumberland, England.  She died before 1379.