William IV Baron Percy De Percy
William IV Baron Percy was born in 1193 in Of, Alnwick, Northumberland, England.¹   He died before July 1245.  He was buried before July 1245 in Salley Abbey, Craven, Yorkshire, England.^1 1 

 Joan De Briwere
Joan was born in 1187 in Of, Stoke, Devonshire, England.¹   She was buried in Hospital, Sandown, Surrey, England.¹ 

 Alice De Percy
Alice was born in 1203.^1 1 

 Ada De Percy
Ada was born in 1210 in Alnwick, Northumberland, England.^1 1 

 Anastasia Percy
Anastasia was born about 1216 in Of, Alnwick, Northumberland, England.¹ 

 Agnes De Percy
Agnes was born in Alnwick, Northumberland, England.^1 1 

 Joan De Percy
¹