Halfdan Sigurdsson , King of Ringerike 
Halfdan was born about 0924 in Rise, Ringerike, Norway. He died after 0970 in Trondheim, Norway.
He had a biological son named Sigurd "Syr".
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Children
Sigurd "Syr" Halfdansson , King of Ringerike
Sigurd "Syr" was born in 0958 in Kvam, Nord Fron, Norway. He died in Bonsnes, Ringerike, Norway.
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