Ralph de Cromwell III & Joan de la Mare 
They had a son named Ralph.
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Personal Details
Joan de la Mare
Joan was born in 1270.1 She died at the age of 78 on August 9th, 1348 in Cromwell & West Hallam, Lincolnshire, England.1
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Children
Ralph de Cromwell IV
Ralph was born in 1307 in Cromwell & West Hallam, Lincolnshire, England.2 He died at the age of 57 on October 28th, 1364.2
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I25020&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I25473&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I25473&style=TABLE