Count Ludwig of Ravensberg & Countess Adelheid of Dassel 
They had a son named Otto.
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Personal Details
Count Ludwig of Ravensberg
Ludwig was born in 1194 in Dassel, Hannover, Prussia.1 Ludwig is no longer alive.
Countess Adelheid of Dassel
Adelheid was born in 1198 in Dassel, Hannover, Prussia.1 She died at the age of 65 on September 14th, 1263.1
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I33447&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I33386&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I33386&style=TABLE