Sigfried von Oldenburg917–
- Name
- Sigfried von Oldenburg
| Birth | about 917 17 59 |
| Birth of a brother | Otto von Oldenburg about 919 (Age 2 years) |
| Birth of a son #1 | Ullrich von Oldenburg about 942 (Age 25 years) |
| Family with parents |
| father |
Sigfried I. von Oldenburg Birth: 900 — Altenburg, Altenburger Land, Thüringen, Germany |
| mother |
Ludmilla von Ringelheim Birth: 858 |
| himself |
Sigfried von Oldenburg Birth: about 917 17 59 — Oldenburg |
|
3 years younger brother |
Otto von Oldenburg Birth: estimated as close to sibling(s) — about 919 19 61 |
| Family with Magdalene of Ascania |
| himself |
Sigfried von Oldenburg Birth: about 917 17 59 — Oldenburg |
| wife |
Magdalene of Ascania Birth: estimated as equal to husband's birth year — about 917 |
| son |
Ullrich von Oldenburg Birth: estimated a gap of 25 years — about 942 25 25 |