Roger de Clifford & Isabelle de Vipont 
They had a son named Robert.
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Personal Details
Isabelle de Vipont
Isabelle was born in 1234 in Brougham Castle, Westmoreland, England.2 She died at the age of 57 in 1291.1
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Children
1st Baron Clifford Robert de Clifford
Robert was born on April 1st, 1274.1 He died at the age of 40 on June 24th, 1314.1
1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I13164&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=clcaldwell&id=I016845
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=clcaldwell&id=I016845