Béla III of Hungary
Oleg's stepbrother, Vladimir Yaroslavych lived a dissolute life and took to himself a priest's wife. When the Galician boyars threatened to kill his wife, Vladimir Yaroslavich took her and his two sons and fled to King Béla III of Hungary (1172–1196). A later chronicle, however, describes the event differently, stating that Oleg and Duke Casimir II defeated Vladimir Yaroslavich and forced him to flee to the Hungarians, after which Casimir II appointed Oleg to Halych.