Count of Rittegau & Northeim Siegfried of Northeim & Mathilda 
They had a son named Benno.
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Personal Details
Count of Rittegau & Northeim Siegfried of Northeim
Siegfried was born in 0965 in Germany.1 He died at the age of 39 in 1004.1
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Children
Count of Rittegau Benno von Northeim
Benno was born in 0990 in Germany.1 He died at the age of 69 in 1059.1