Contemporary poetryThe extant poetry on Styrbjörn is found in Styrbjarnar þáttr Svíakappa, where the following stanza mentions Styrbjörn. Skaldic poems are generally held to be contemporary documentation:
His battle against king Eric was also described by the contemporary Þórvaldr Hjaltason, in the following lausavísur:
Styrbjarnar þáttr SvíakappaStyrbjörn was unusually big, strong and unruly (for a Viking) and although he was only a little boy he managed to kill a courtier who accidentally had hit him on the nose with a drinking horn. When he was 12 years old he asked his uncle for his birthright, but when he was denied the co-rulership of Sweden he sulked for a long time on his father's mound. When he was 16 the Ting decided that he was too unruly to be king of Sweden. As a compensation his uncle Eric gave him 60 well-equipped longships whereupon the frustrated Styrbjörn took his sister Gyrid and left. He ravaged the shores of the Baltic Sea and when he was twenty, he conquered the stronghold of Jomsborg from its founder Palnetoke, and became the ruler of the Jomsvikings. After some time he allied with the Danish king Harold Bluetooth and married his sister Gyrid to him. Styrbjörn married Harold's daughter Tyra, whom he was given by Harold for conquering Jomsborg. (Styrbjörn had the son Torkel Styrbjörnsson with Tyra. Torkel had a daughter named Gytha Thorkelsdóttir, who married Godwin, Earl of Wessex and became the mother of Harold II of England). Harold gave him even more warriors and now Styrbjörn was about to reclaim the throne of Sweden. He sailed with a huge force which included 200 Danish longships in addition to his own Jomsvikings. When they arrived at Föret (Old Norse: Fyris) in Uppland he burnt the ships in order to force his men to fight to the end. The Danish force changed its mind and returned to Denmark. Styrbjörn marched alone with his Jomsvikings to Gamla Uppsala. His uncle was, however, prepared and had sent for reinforcements in all directions. During the first two days, the battle was even. In the evening, Eric went to the statue of Odin at the Temple at Uppsala where he sacrificed. He promised Odin that if he won the battle, he would belong to Odin and arrive at Valhalla in ten years from then. The third day, Eric threw his spear over the enemy and said "I sacrifice you all to Odin". Styrbjörn and his sworn men stayed, and died. Eyrbyggja sagaThe Eyrbyggja saga has a short summary of Styrbjörn's career in connection with one of its protagonits:
Hervarar sagaThe Hervarar saga gives an even shorter summary of Styrbjörn and his battle with his uncle Eric:
Knýtlinga sagaThe Knýtlinga saga tells that Styrbjörn was the son of the Swedish king Olaf. When Harald Bluetooth ruled in Denmark, Styrbjörn was making war in the east (í hernaði í Austrveg) and came to Denmark where he took Harald captive. Harald gave his daughter Tyra to Styrbjörn and joined him on his expedition to Sweden. When Styrbjörn had arrived, he set his own ships on fire, but when Harald saw that Styrbjörn no longer had any ships he sailed back out on Mälaren (Löginn) and back to Denmark. Styrbjörn fought his uncle Eric on the Fyrisvellir and he fell together with most of his men. Some of his men fled and this the Swedes called the Fyriselta, the chase of the Fyris. Gesta DanorumA more pro-Danish version is told in Gesta Danorum (book 10). In this source the Danish chronicler Saxo Grammaticus tells that Styrbjörn was the son of the Swedish king Björn. Styrbjörn had an uncle named Olaf whose son Eric had taken the Swedish kingdom from Styrbjörn. Styrbjörn went to Harald Bluetooth bringing his sister Gyrithe with him, and humbly asked Harald for help. Harald decided to be friends with Styrbjörn and married his sister Gyrithe. Harald then conquered the land of the Slavs and took the stronghold Julin (Jomsborg), which he gave to Styrbjörn to command with a strong force. Styrbjörn and his force (the Jomsvikings) dominated the seas winning many victories, and they were more beneficial to Danmark than any force on land would have been. Among the warriors were Bue, Ulf, Karlsevne and Sigvald. Styrbjörn wanted revenge and asked Harald for help to take the throne of Sweden. Harald wanted to help Styrbjörn and to this end he sailed to Halland, but was informed that the German emperor Otto had attacked Jutland and Harald was more eager to defend his own country than to attack another one. When Harald had driven away the Germans, Styrbjörn had already rashly departed to Sweden with his own force where he fell. Archaeological evidence
Side B of the Högby Runestone.
Runestones are counted as historic documents about the events of the Viking Age in Scandinavia. The following four runestones may mention Jomsvikings who died with Styrbjörn the Strong. Note that the first runestone mentions a warleader named Toki Gormsson and he may be a son of the Danish king Gorm the Old, an interpretation which fits the fact that Styrbjörn was allied with another son of Gorm, Harald Bluetooth.
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