Overview
Iziaslav was the son of Vladimir I of Kiev and Rogneda of Polotsk. He was the progenitor of the Iziaslavichi of Polotsk.
When his father converted to Christianity in 988, he had to divorce all his previous wives, including Rogneda. She and her son Iziaslav were exiled back to the lands of Polotsk – first to Iziaslav, and later to Polotsk.
Following Norse tradition, Iziaslav was sent with his mother to rule her homeland. There is also a legend that Rogneda tried to get Iziaslav to slay his father.
Despite possibly going against the will of his father, Iziaslav was able to continue his rule in Polotsk. He was first to make Polotsk autonomous from the Grand Duke of Kiev passing his title to his descendants after his death. His principality carried a wide degree of autonomy that later was passed on to his descendants. His glory was commemorated after an established city that was named after him.
From Wikipedia (CC BY-SA 4.0).