Graf Gebhard von Diessen I & Richilda von Sponheim 
They had a son named Engelbert.
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Personal Details
Graf Gebhard von Diessen I
Gebhard was born in 1071.1 He died at the age of 31 on October 3rd, 1102.1
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Children
Count of Wassenburg Engelbert von Diessen
Engelbert was born in 1097.2 He died at the age of 64 on September 20th, 1161.2
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=selvage1&id=I111383
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I25370&style=TABLE
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I25370&style=TABLE