Rivallon d'Avranches & Matilda de Muneville 
They had a son named William.
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Personal Details
Rivallon d'Avranches
Rivallon was born in 1075 in Kent, England.1 He died at the age of 59 in 1134 in Folkstone, Kent, England.1
Matilda de Muneville
Matilda was born in 1090 in Folkstone, Kent, England.1 She died at the age of 44 in 1134 in Folkstone, Kent, England.1
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=jwflank&id=I24138
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I83455&style=TABLE
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I83455&style=TABLE