Blot-Sven, Sweyn the Sacrificer

Sweyn (Swedish: Blot-Sven, Sweyn the Sacrificer) was a Swedish king c. 1080,[2] who replaced his Christian brother-in-law Inge as King of Sweden, when Inge had refused to administer the blóts (pagan sacrifices) at the Temple at Uppsala.

There is no mention of Sweyn in the regnal list of the Westrogothic law, which suggests that his rule did not reach Västergötland.[2] According to Swedish historian Adolf Schück he was probably the same person as Håkan the Red and was called the Blót Swain (a swain who was willing to perform the blót) as an epithet rather than a personal name.

https://en.wikipedia.org/wiki/Blot-Sweyn

The later Legend of Saint Eskil tells that Inge was chased away from the kingdom. They then elected an idolator for king by the name Sweyn, an unworthy man and with reason called Blood-Sweyn.

 He had this name because he made the people drink blood from bulls that had been sacrificed to the gods, and he ate the sacrificial meat. The people assembled around their king in Strängnäs, where they butchered oxen and sheep, and gave offerings to their gods. They had a great banquet in honour of the king and their gods. The English bishop Eskil then appeared and tried to convert the pagans to Christianity. They would not listen, however. Eskil prayed, and God sent thunder, hail, snow and rain destroying the sacrificial altar and beasts of sacrifice. Not a single drop fell on the bishop. The pagans were not impressed and furiously, they attacked Eskil. A diviner named Spåbodde hit him on the head with a stone, while another man crushed his head with an axe. Some chieftains dragged the dying martyr to the king saying that Eskil had used magic arts to control the weather. As soon as the unrightful king had sentenced Eskil to death, he was taken to the valley where the monastery later was founded, and he was stoned to death[4]
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King Inge and Helena were the parents of four children:

Christina, married Prince Mstislav I of Novgorod, later Grand Duke of Kiev.

https://en.wikipedia.org/wiki/Inge_the_Elder

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