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.
Grigory Bogdanovich Volovich Grigory Bogdanovich Volovich (born in 1535 – died in 1577) was a statesman of the Grand Duchy of Lithuania, diplomat of the Lord's gentleman (from 1548), the Mayor of Grodno (1558–1566), Marshal of Dvorny (1560–1563), of the Lord's Stalker (1567–1574), governor of Smolensk Voivodeship (1571–1577), the elder of Mstsislaw (1548–1567), sovereign of Varniany and Zel’va (1558–1569).