Nielsen Hayden genealogy
Ancestors of Mathilde von Northeim
┌── Siegfried I von Northeim ( - 1004)
┌── Benno von Northeim ( - Between 1047 and 1049)
│ └── Mathilde
│
┌── Otto I von Northeim (Abt 1025 - 11 Jan 1083 bur.Nicolai Chapel, Northeim, Lower Saxony, Germany)
└── Richenza ( - Bef 11 Jan 1083)