Halfdan Sigurdsson 
Halfdan was born in Probably Ringerike, Norway. Halfdan's father was Sigurd Sow Halfdansson King in Ringerike and his mother was Asta Gudbrandsdottir. He had a brother named Harald III Haardraada. He had a half-brother named Olaf II 'The Holy King'. He died before 1047.
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