Oleg Yaroslavich "Nastasich" (after 1161 â 1189) was Prince of Galicia (1187; 1189).
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 (whom Yaroslav had left in order to take OlegâÂÂs mother), and imprisoned Oleg.
Yaroslav died on 1 October 1187, giving Peremyshl (Przemyà Âl) to his only legitimate son, Vladimir Yaroslavich.