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.

Biography

Traditional sources state that Sigurd Hart was only 12 years old when he slew a berserker named Hildibrand in a duel, and 11 other men. He married a woman named Ingeborg (supposedly the daughter of the historical Jutish chieftain Harald Klak, c. 785 – c. 852, although Harald was probably too old for that to be true). Sigurd Hart and Ingeborg had children named Guthorm Sigurdsson and Ragnhild Sigurdsdotter. When Sigurd Hart's uncle, king Fróði of Ringerike died, Sigurd Hart supposedly went to Norway to succeed him as king of Ringerike. There are a number of unlikely claims or implied claims about Sigurd Hart's descendants in Ragnarssona þáttr, Heimskringla, and Fagrskinna.