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Son of King Halfdan "the Tall" Frodasson, King of Denmark and Sigrid Aunsdotter, Queen of Denmark Brother of Hailaga Halfdansson, {Legendary}; Rørik "Slængeborræ" Halfdansson, "slaunvanbauga"; Olaf Halvdanssøn and Hrothgar Halfdansson, Scylding King of Roskilde Denmark
https://en.wikipedia.org/wiki/Heorogar