Tracing Douglas family roots - unraveling history, one generation at a time.
- 1146
 | Friedrich IV of Swabia 1145-1167 |
| Friedrich IV of Swabia | |
| B: | 1145 |
| D: | 1167 |
| Gertrude Von Sulzbach -1146 |
| Gertrude Von Sulzbach | |
| D: | 14 Apr 1146 |
| Konrad III Hohenstaufen King of Germany Abt 1093-1152 |
| Konrad III Hohenstaufen King of Germany | |
| B: | Abt 1093 |
| D: | 15 Feb 1151-1152 |
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