Sigurd Hart

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Sigurd Hart or Sigurd Hjort was a legendary king of Ringerike (modern central south Norway), during the late 9th or early 10th centuries. he is mentioned in Ragnarssona þáttr ("The Tale of Ragnar's Sons") and in Halvdan Svartes saga ("Halfdan the Black's Saga").

Ragnarssona þáttr states that Sigurd Hart was the son of Helgi the Sharp (the great-great-grandson of king Ring of Ringerike) of the Dagling dynasty and Helgi's wife Aslaug. Helgi was reportedly the son-in-law of Sigurd Snake-in-the-Eye (one of Ragnar Lodbrok's sons) and Blaeja, the daughter of king Aelle II of Northumbria.