Harthacnut I of Denmark

Harthacnut or Cnut I (Danish: Hardeknud) (born c. 880) was a legendary King of Denmark.

Adam of Bremen claims that Harthacnut was the son of an otherwise unknown king Sweyn, while the saga Ragnarssona þáttr makes him son of the semi-mythic viking chieftain Sigurd Snake-in-the-Eye, himself one of the sons of the legendary Ragnar Lodbrok.

The only primary source thought to refer to Harthacnut is the work of clergyman Adam of Bremen – who came from Germany to record the history of the Archbishops of Bremen. He states that a king Helghe was deposed and Denmark was conquered by Swedes led by Olof the Brash. Along with two of his sons, Gyrd and Gnupa, Olof took the realm "by force of arms," and they ruled it together, thus founding the House of Olaf in Denmark. Adam reports that they were followed by a Sigtrygg. That Sigtrygg was the son of Gnupa, by a Danish noblewoman named Asfrid, is shown on two runestones near Schleswig, erected by his mother after his death.

Adam then relates that after Sigtrygg reigned a short time, during the tenure of Archbishop Hoger of Bremen (909–915/917), Hardegon (usually interpreted as a corrupted rendering of Harthacnut), son of king Sweyn, came from "Northmannia" the "land of the Northmen," by which he may have meant Norway, Normandy, which had recently been colonized by Danish Vikings, or even northern Jutland. Harthacnut immediately deposed the young king Sigtrygg, and then ruled unopposed for approximately thirty years. Adam later refers to an attack on Denmark by Henry I of Germany, naming the defending king as Hardecnudth Vurm. Historians generally agree that Vurm (English: worm or serpent) is a German rendering of the Danish name Gorm, and this leads to alternative interpretations, that this is reference to Gorm, son of Harthacnut, or that it is a double-name indicating that Harthacnut and Gorm were the same person. The Saxon chronicles of Widukind of Corvey reports the defeat and forced baptism of the Danish king Chnuba (Gnupa), in 936 at the hands of German king Henry. Likewise, Olav Tryggvasson's Saga tells of Gnupa's defeat by Gorm the Old. Some historians (e.g. Storm) have taken these as indications that Sigtrygg's father Gnupa still ruled at least part of Denmark much later than credited by Adam of Bremen.

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