Oleg Yaroslavich "Nastasich" (after 1161 – 1189) was Prince of Galicia (1187; 1189).
[1] Oleg was the illegitimate son of Prince Yaroslav Osmomysl by his mistress, Nastaska, a daughter of a local boyar.
[1][2] The Galician boyars had his mother burned as a witch, forced his father to reinstate his wife (whom Yaroslav had left in order to take Oleg’s mother),[2] and imprisoned Oleg.
[1] Yaroslav died on 1 October 1187, giving Peremyshl (Przemyśl)[1] to his only legitimate son, Vladimir Yaroslavich.
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