Hálfdanar saga Brönufóstra to his father's kingdom and defeats and kills Soti and his Vikings. Although numerous sagas contain analogs to the iconic cave battle with Grendel and his mother in "Beowulf," none is closer to the Old English epic than is Hálfdan’s cave battle with Járnnefr and his wife. The saga is found in three, 15th-century vellum manuscripts, but its post-medieval popularity is evidenced by its preservation in over four dozen paper manuscripts. In the 18th century it served as the source for the first known saga forgery. "Hálfdanar saga Brönufóstra" has a sequel in "Sörla saga sterka", where it becomes clear
Old English literature which concludes Beowulf's fight with the monsters during his swimming match with Breca: Crowne drew on examples of the theme's appearance in twelve Anglo-Saxon texts, including one occurrence in Beowulf. It was also observed in other works of Germanic origin, Middle English poetry, and even an Icelandic prose saga. John Richardson held that the schema was so general as to apply to virtually any character at some point in the narrative, and thought it an instance of the "threshold" feature of Joseph Campbell's Hero's Journey monomyth. J.A. Dane, in an article (characterised by Foley as "polemics without rigour") claimed that