Hadingus was one of the earliest legendary Danish kings according to Saxo Grammaticus' Gesta Danorum, where he has a detailed biography.

Gram steals Signe from her wedding, kills the husband (Henry, King of Saxony) and takes her to Denmark, where Hadingus is born.

When Gram is killed by Swipdag, King of Norway, Hadingus is taken to Sweden and is fostered by the giant Wagnofthus and his daughter Harthgrepa.

The Danish History, Book One[1] Hadingus accepts Harthgrepa's embraces and when he wants to travel back to Denmark she accompanies him.

Name spellings are derived from Oliver Elton's 1905 translation, The First Nine Books of the Danish History of Saxo Grammaticus, via Wikisource.