Vladimir Olgerdovich was a son of which ruler of medieval Lithuania?
Vladimir Olgerdovich Vladimir Olgerdovich (Belarusian: Уладзімер Альгердавіч , Lithuanian: "Vladimiras Algirdaitis" , Polish: "Włodzimierz Olgierdowic" , Ukrainian: Володимир Ольгердович ; died after 1398) was a son of Algirdas, Grand Duke of Lithuania, and his first wife Maria of Vitebsk. He was Grand Prince of Kiev from 1362 to 1394. His sons Ivan and Alexander started the Belsky and Olelkovich families.
Magnus I, Duke of Mecklenburg Magnus I, Duke of Mecklenburg (1345 – 1 September 1384) was Duke of Mecklenburg from 1383 until his death. Magnus was the third son of Duke Albert II of Mecklenburg and his wife Euphemia of Sweden, the sister of the King Magnus IV of Sweden. Sometime after 1362, he married Elizabeth of Pomerania-Wolgast, daughter of Barnim IV, Duke of Pomerania.