Oleg Yaroslavich
Oleg Yaroslavich "Nastasich" was Prince of Galicia.
Life
Oleg was the illegitimate son of Prince Yaroslav Osmomysl by his mistress, Nastaska, a daughter of a local boyar. The Galician boyars had his mother burned as a witch, forced his father to reinstate his wife, and imprisoned Oleg.Yaroslav died on 1 October 1187, giving Peremyshl to his only legitimate son, Vladimir Yaroslavich.