Halfdan Haraldsson the Black
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Halfdan Haraldsson or Halfdan the Black (not to be confused with his grandfather and namesake
Halfdan the Black
Halfdan the Black was a ninth-century king of Vestfold. He belonged to the House of Yngling and was the father of Harald Fairhair, the first king of Norway.-Biography:...

) was a son of Harald I of Norway
Harald I of Norway
Harald Fairhair or Harald Finehair , , son of Halfdan the Black, was the first king of Norway.-Background:Little is known of the historical Harald...

 by his first wife, Åsa, the daughter of Jarl Håkon Grjotgardsson
Håkon Grjotgardsson
Håkon Grjotgardsson , nicknamed Håkon the Rich was the son and heir of Grjotgard Herlaugsson Lade. Håkon became the ruler of the petty kingdom of Trøndelag, the Earl of Lade in the eastern part of Trondheim, Norway, when he succeeded his father...

 of Lade
Jarls of Lade
The Jarls of Lade or Old Norse Hlaðir were a dynasty of Norwegian rulers, who ruled Trøndelag and Hålogaland from the 9th century to the 11th century. -Lade Gaard:...

. He was made sub-king of the Trondelag by his father, along with his brother Halfdan the White. According to Heimskringla, Halfdan the Black was poisoned, possibly at the behest of his sister in law Gunnhild, Mother of Kings.
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