Oleg Yaroslavich "Nastasich" (after 1161 – 1189) was Prince of Galicia (1187; 1189).[1]
Life
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]