Walter de Tattershall & Iseult Pantulf 
They had a son named Robert.
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Children
Robert de Tattershall
Robert was born in 1187 in Castle Tattershall, Lincolnshire, England.1 He died at the age of 62 on July 16th, 1249 in Buckenham, Norfolk, England.1
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=clcaldwell&id=I098831&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=clcaldwell&id=I011359&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=clcaldwell&id=I011359&style=TABLE