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In page Rogneda of Polotsk:

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The later Suzdalian Chronicle tells a story, most likely taken from a Norse saga, of Rogvolod's daughter – here called "Gorislava" – plotting against Vladimir and asking her elder son, Izyaslav, to kill him.[1] As was the Norse royal custom, she was sent with her elder son to govern the land of her parents, i.e. Polotsk.[citation needed] Izyaslav's line continued to rule Polotsk and the newly found town of Izyaslavl (now called Zaslawye).[citation needed]