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
Beowulf its "popularity" took it). There are Scandinavian sources, international folkloric sources, and Celtic sources. 19th century studies proposed that "Beowulf" was translated from a lost original Scandinavian work, but this idea was quickly abandoned. But Scandinavian works have continued to be studied as a possible source. Proponents included writing in 1886 that an Old Norse original version of "Beowulf" must have existed, but that view was later debunked by (1914) who pointed out that "Beowulf" is fundamentally Christian and written at a time when any Norse tale would have most likely been pagan. The epic's possible connection to "Grettis saga"