Graf Arnulf von Diessen & Adelheid von Sulzbach 
They had a son named Gebhard.
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Children
Graf Gebhard von Diessen I
Gebhard was born in 1071.1 He died at the age of 31 on October 3rd, 1102.1
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=selvage1&id=I111383
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=bevangenealogy&id=I8533
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=bevangenealogy&id=I8533