Vladimir Olgerdovich was a son of which ruler of medieval Lithuania?
Algirdas Algirdas (Belarusian: Альгерд , Russian: Ольгерд , Polish: "Olgierd" ;  1296  – May 1377) was a ruler of medieval Lithuania. He ruled the Lithuanians and Ruthenians from 1345 to 1377. With the help of his brother Kęstutis (who defended the western border of the Duchy) he created an empire stretching from the present Baltic states to the Black Sea and to within fifty miles of Moscow.
Igor II of Kiev He was the chosen successor of his brother, Vsevolod II of Kiev. Though his brother had extracted promises of loyalty from his Kievan subjects, Igor and his family, the Olgovichi, were unpopular and there was resistance against his accession. The chroniclers accused Igor of being dishonest, greedy, scheming, and violent. He had reigned less than two weeks before the Kievans invited his cousin and rival, Iziaslav Mstislavich, to be their prince. Reneging on a promise he had made not to seek power, Iziaslav attacked and defeated Igor and his brother Svyatoslav.