Ld. Roger of Warkworth Clavering
Roger of Warkworth was born about 1220.  He died in 1249.

 Isabel
Isabel was born about 1227.  She died after 1256.

 Lord Robert Clavering
Robert was born in 1247 in Clavering, Essx, England..  He died at the age of 63 on April 29th, 1310.