Quote Originally Posted by oz View Post
Vk157 might've been this dude, or some kind of connection to it:

https://en.m.wikipedia.org/wiki/Sviatopolk_I_of_Kiev
From the Wikipedia-article: "The I-S2077 subclade of Y-DNA haplogroup I-Z63 was sampled on an elite warrior buried in Bodzia (Poland) in a rich burial from ca. 1010-1020 AD. All artefacts there indicate a strong relation to the Kievian Rus ruling elite, so this man who probably succumbed to combat wounds, was in a close relationship with Svyatopolk. The cemetery in Bodzia is exceptional in terms of Scandinavian and Kievian Rus links. The Bodzia man (sample VK157, or burial E864/I) was not a simple warrior from the princely retinue, but he belonged to the princely family himself. His burial is the richest one in the whole cemetery, moreover, Strontium analysis of his teeth enamel shows he was not local. It is assumed that he came to Poland with Svyatopolk, and met a violent death in combat. This corresponds to the events of 1018 AD when Sviatopolk himself disappeared after having retreated from Kiev to Poland. It cannot be excluded that the Bodzia man was Sviatopolk himself."

That is very speculative. It is more likely that the same process happened in Russia and in Poland: The founding of a new state, initiated by a Viking aristocracy. In both countries this idea is not very popular - however, we have more evidence in case of Russia. But there is also some indication that the first Polish rulers, the Piasts, were of Viking origin.