Lord of Rayleigh Robert de Essex & Gunnor Bigod 
They had a son named Henry.
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Personal Details
Lord of Rayleigh Robert de Essex
Robert was born in 1085 in Rayleigh, Rochford, Essex, England.1 He died at the age of 48 in 1133 in Haughley, Stow, Suffolk, England.1
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Children
Henry de Essex
Henry was born in 1099 in Raleigh, Essex, England.1 He died at the age of 64 in 1163.1
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=:3302586&id=I661705864
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=tamer&id=I15855
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=tamer&id=I15855