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Male Count of Rittegau, Duke of Bavaria Otto von Northeim I Click to view Count of Rittegau, Duke of Bavaria Otto von Northeim I in the family tree

Otto was born in 1025 in Bavaria, Germany.1   Otto's father was Count of Rittegau Benno von Northeim and his mother was Eilika.  His paternal grandparents were Count of Rittegau & Northeim Siegfried of Northeim and Mathilda.  He was an only child.  He died at the age of 57 on January 11th, 1082.1 

Family Details of Otto's family with Richenza of Swabia

1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=PED&db=jhmjr&id=I33648
Further source/citation:
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=jhmjr&id=I32851

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