William FitzWilliam & Agnes de Grey 
They had a son named @William.
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Children
@William FitzWilliam
@William was born in 1270 in Emley, Wakefield, Yorkshire, England. He died at the age of 72 in 1342 in Sprotbrough, Doncaster, Yorkshire, England.
1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=stolp&id=I3895
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=stolp&id=I15543
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=stolp&id=I15543