Frederick Hohenstaufen & Adelaide von Filsgau 
They had a son named Frederick.
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Children
Count of Bueren Frederick von Buren von Hohenstaufen
Frederick was born in 1015 in Buren, Germany.2 He died at the age of 79 in 1094.2
1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=jdp-fam&id=I7197
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I7155&style=TABLE
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I7155&style=TABLE