William de Percy & Alice de Ros 
They had a son named William.
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Children
Death Notes
D: 1174/1175
4th Baron de Percy William de Percy II
William was born in 1112 in Topcliffe, Yorkshire, England.2 He died at the age of 62 in 1174 in Sally, Craven, Yorkshire, England.2
1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I67251&style=TABLE
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=stolp&id=I8047&style=TABLE
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=stolp&id=I8047&style=TABLE