Count Eberhard of the Mark I & Countess Irmgard of Berg 
Eberhard and Irmgard were married in 1273.1 They had a son and two daughters, named Engelbert, Margarethe and Kunigunde.
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Personal Details
Count Eberhard of the Mark I
Eberhard was born in 1249 in Koln, Rheinland, Prussia.1 He died at the age of 59 on July 4th, 1308.1
Countess Irmgard of Berg
Irmgard was born in 1256 in Katzenelnbogen, Hessen-Nassau, Prussia.1 Irmgard is no longer alive.
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Children
Countess Margarethe of the Mark
Margarethe was born in 1278 in Katzenelnbogen, Hessen-Nassau, Prussia.2
Count Engelbert of the Mark
Engelbert was born in 1282 in Katzenelnbogen, Hessen-Nassau, Prussia.1 He died at the age of 46 on July 18th, 1328.1
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=bevangenealogy&id=I33377&style=TABLE
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=bevangenealogy&id=I33438
2 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=bevangenealogy&id=I33438