物語はスウェーデンのセーデルマンランドにあるバッドバイ(Bjudby)のルーンストーンSö54と比較されている。この石には、トルストンの主な家族について彫られており、父親の''ヴァイキンガー(Víkingr)''の他に3人の息子が同じ名前であることが分かっている。他の登場人物の名前も密接に対応している<ref>"Tales of Generations: A comparison between some Icelandic and Geatish narrative motifs", by Guðmundsdóttir, Aðalheiður. (2016) - In: Scripta Islandica vol. 67 (2016) p. 5-36</ref>。
==粗筋==In Sweden, [[Viking (Norse Mythology)|Viking]] sires nine sons by a second wife. スウェーデンにて、ヴァイキングは2番目の妻との間に9人の息子を得た。 Thorsten (Thorstein, or Thor's Stone) is the oldest son of Viking. Viking befriends his worthy foe Njorfe, King of Upplands, in Norway, who also has nine sons. The two groups of sons are highly competitive against each other. In a brutal ball game, they beat and maim each other, breaking each other's arms. A son of Viking, near death, slays a son of Njorfe.
Viking scolds this son and sends him to an island in Lake [[Vänern]]. Two more sons go with him, including Thorsten. Viking tells Thorsten to wait quietly on the island until the danger is over. Njorfe's sons want revenge. They use magic to conjure a frost that freezes the lake and travel across it to attack the three sons of Viking. Two of Viking's sons survive: Thorsten and Thorer. Two of Njorfe's sons survive, including his eldest son, [[Jokul]], a sorcerer. Njorfe's sons use magic to discover that Thorsten and Thorer are alive.