married King Eric X of Sweden Самонова, Мария Николаевна (2012). "Полоцкое княжество в системе династических связей и политических взаимоотношений Руси...
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Archived from the original on 7 June 2021. Retrieved 30 May 2019. Полоцкое княжество. history-belarus.by (in Russian). Archived from the original on 14...
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