Tracing Douglas family roots - unraveling history, one generation at a time.
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 | Harald II Blue Tooth King of Denmark (910-986)
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 | Thyra Haroldsdottir ( -1000)  |
| Sweyn Forkbeard King of Denmark & England (965-1014) |
| Styrbyron Olafsson ( -986)
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| Thyra Haraldsdottir ( -1000)
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| Thorgils Sprakalegg (936- ) |
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