Nielsen Hayden genealogy
Ancestors of Heinrich I
- 1118 ┌── Hermann I of Werl (Abt 940 - Bef 988)(m. Between 978 and 979)
┌── Hermann II (Abt 980 - 1025)
│ │ ┌── Conrad I, King of Burgundy ( - 19 Oct 993) =>
│ └── Gerberga of Burgundy ( - Aft 1016)(m. Between 978 and 979)
│ └── Matilda of the West Franks ( - Abt 981) =>
│
┌── Bernhard
┌── Konrad von Arnsberg (Abt 1040 - 19 Jul 1092)
Heinrich I ( - Between 1115 and 1118)
│
│ ┌── 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)