The third stage having been reached in the development of the Hroar-Helgi story, in which the brother who is slain is avenged by one of his descendants, it was easy and natural for it to fall in with the "exile-return" type. The type is not an artificial type, it is founded on human nature. The guileless and weak must yield to the designing and strong. History teems with illustrations of the fact that he wears the crown who can win it and hold it. Where a kingdom is the prize, a man is under a mighty temptation when he sees that he can seize it by brushing aside a weak ruler and a still weaker heir, or, the ruler being out of the way, the young heir only. And it is natural that, the young heir surviving, he should avenge a murdered parent, regain the crown, and not permit the usurper to enjoy the fruits of his crime unmolested. Friends each party would also have, actuated, if by nothing else, by self-interest, which is bound up in the success of their chief. What the Hroar-Helgi story in its third stage of development may have been we do not know. We are only told that "Yrsa's son will avenge Frothi's murder of Halfdan." But the story was well prepared for the type it was to assume. That the story was clearly regarded as one of this type is evident from the fact that in Johannes Bramis' _Historia Regis Waldei_ Frodas is the usurper of the throne which by right belongs to Waldef.[131] It is not necessary to repeat the story; it has all the characteristics of the "exile-return" type. As a whole, it has no connection with the Hroar-Helgi story; and it contains the only instance known of the use of Frothi outside the story where he originally belongs. But he is so typically the same person, with the same unlovable characteristics, that he can be none other than the Frothi who plays such a conspicuous part in the history of the Scylding kings. The use of Frothi as a typical usurper in the English Waldef story is also a very strong indication that the story in which he has his proper setting was current in England; otherwise, by what channel did he get into the Waldef story?[132]