Halfdan

King of Denmark.

According to the Hrolfs saga Kraka, Halfdan was brother of Frodi and father of Helgi and Hroar. His reign didn't last long, because his brother killed him. But according to the Skjoldunga saga, Frodo (Frodi) was his father, not his brother; his brother was Ingialldus (Old English Ingeld), and it was Ingialldus who murdered him.

In the Old English Beowulf, his name was Healfdene. Healfdene was a son of Beow the Dane and grandson of Scyld Scefing (Skiold), and he was the father of Heorogar, Hrothgar (Hroar), Helga (Helgi), and unnamed daughter who married Onela, the king of Sweden.