The essential difference between the story as it is in the _Skjọldungasaga_ and as it is in the _Hrólfssaga_ is that, in the _Skjọldungasaga_, Ingjald is said to be the brother of Halfdan; while in the _Hrólfssaga_, Frothi is Halfdan's brother. The _Hrólfssaga_ has, however, preserved the earlier account. The _Skjọldungasaga_ dates from about the year 1200.[161] About the year 950, Frothi is said to be the slayer of Halfdan;[162] and in _Historia Regis Waldei_, Frothi is made the typical villain in a Hroar-Helgi type of story[163] (the "exile-return" type), so that, in the version of the story that was current in England, Frothi must have been the slayer of his brother. The conflicting statement that it was Ingjald who slew Halfdan requires, therefore, an explanation. In Saxo's _Gesta Danorum_, the story about Hroar and Helgi is told twice. It is first told in the second book, where we find the version with which is connected the story about Hrolf Kraki, Yrsa, Athils, and Ingjald and his son Agnar, whom Bjarki slew; it is told a second time in the seventh book, where Hroar and Helgi are called Harald and Halfdan, and where the story about them is another version of the same story that we have in the _Hrólfssaga_. Not only do Hroar and Helgi appear (disguised under different names), but Frothi and Ingjald again appear. A comparison of the line of Danish kings as Saxo has it, with the line of the same kings in the _Skjọldungasaga_,[164] shows that the _Skjọldungasaga_ has the story about Hroar and Helgi just where Saxo's second story about them (i.e., in his seventh book) puts in its appearance. These lines of kings are as follows:-- SAXO: SKJỌLDUNGASAGA: