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.
Yuri Dolgorukiy Yuri I Vladimirovich (Russian: Юрий Владимирович ), known under his soubriquet Yuri Dolgorukiy (Russian: Юрий Долгорукий , literally "Yuri the Long-Armed"; also known in various accounts as "Gyurgi, Dyurgi", or "George I of Rus"), (c. 109915 May 1157) was a Rurikid prince and founder of the city of Moscow. He reigned as Velikiy Kniaz (Grand Prince) of Kiev from September 1149 to April 1151 and then again from March 1155 to May 1157. Yuri played a key role in the transition of political power from Kiev to Suzdal following the death of his elder brother Mstislav the Great in 1132.