Question: Vladimir Olgerdovich was a son of which ruler of medieval Lithuania?
Context: Anangabhima Deva III (Odia: ତୃତୀୟ ଅନଙ୍ଗଭୀମ ଦେବ) was a powerful ruler and reformist of the Eastern Ganga Dynasty that ruled an early medieval Odisha centered empire in eastern India from the year 1211-1238 A.D.  He was successful in maintaining a large extent of territory that stretched from the river Ganga in the north to Godavari in the South.  He had successfully defeated the Kalachuris on the western frontiers of the empire and established a matrimonial alliance with them.  His brother or brother in law, Rajaraja II became the ruler of the Dynasty in 1198, and was overrun by the Muslims of Bengal, who invaded Odisha in 1206.  When Anangabhima III came into power, he expelled the Muslims of Bengal from his kingdom.  He had a son, Narasimha Deva I, who would later invade Bengal in 1243, and captured the capital city, Gauda.  He was a reformist in the social and spiritual structure of the Odia society as the vaishnavite deity Jagannath was declared as the supreme ruler of the empire and the emperor as the deputy under him. Kęstutis (] ; born ca. 1297, died on 3 August or 15 August 1382 in Kreva) was a ruler of medieval Lithuania.  He was the Duke of Trakai and governed the Grand Duchy of Lithuania, 1342–82, together with his brother Algirdas (until 1377), and with his nephew Jogaila (until 1381).  He ruled over the Lithuanians and Ruthenians. Vladimir Terentyevich Pashuto (Russian: Владимир Терентьевич Пашуто ; April 19, 1918 – June 10, 1983) was a Russian Marxist historian who specialized in the history of medieval Lithuania and Russia, especially in their foreign policies. 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. Đorđe Branković (, Latin: "Georgius Brankovich" , Romanian: "Gheorghe Brancovici" ; 1645 – 19 December 1711) was a Transylvanian Serb diplomat, writer, and self-proclaimed descendant of the medieval Serbian Branković dynasty.  He served as the agent representing the ruler of Transylvania at the Ottoman Porte.  In 1680, he moved to Wallachia, whose ruler sent him as an emissary to the Habsburg Emperor Leopold I in 1688.  That year, the emperor conferred the title of Imperial Count on Branković.  After Habsburg troops captured parts of Serbia from the Ottoman Empire during the Great Turkish War, Branković attempted to restore the medieval Serbian state with him as its hereditary ruler.  His venture failed in its inception, and Habsburg authorities arrested him in 1689.  He lived on as a captive in Vienna and Cheb, though he was not held in a prison.  He wrote the "Slavo-Serbian Chronicles", which was influential in the development of early modern Serbian historiography. 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. The Belsky or Belski family (Russian: Бельский; plural: Бельские ) was a princely family of Gediminid origin in the Grand Duchy of Lithuania.  It later deflected to the Grand Duchy of Moscow and played a key role during the regency of Ivan IV of Russia.  The family started with Ivan Vladimirovich, son of Vladimir Olgerdovich and grandson of Algirdas, and ended with Ivan Dmitrievich Belsky in 1571.  The Belsky name was derived from their principal possession of Bely, Tver Oblast. Tomas Baranauskas (born September 12, 1973 in Kaunas) is a Lithuanian historian specializing in the history of medieval Lithuania.  He is the author of the book "The Formation of the Lithuanian State". Jovan Vladimir or John Vladimir (; c. 990 – 22 May 1016) was the ruler of Duklja, the most powerful Serbian principality of the time, from around 1000 to 1016.  He ruled during the protracted war between the Byzantine Empire and the First Bulgarian Empire.  Vladimir was acknowledged as a pious, just, and peaceful ruler.  He is recognized as a martyr and saint, with his feast day being celebrated on 22 May. The Theotokos of Vladimir (Greek: Θεοτόκος του Βλαντίμιρ ), also known as Our Lady of Vladimir, Vladimir Mother of God, or Virgin of Vladimir (Russian: Владимирская Икона Божией Матери ) is a medieval Byzantine icon of the Virgin and Child.  In 1169 Andrei Bogolyubsky sacked Kiev, and, after plundering the city, stole much religious artwork, including a Byzantine "Mother of God" icon which was transferred to Vladimir (for references see Yury Dolgorukiy and Andrey Bogolyubskiy).  It is one of the most venerated Orthodox icons and a fine and early example of the iconography of the "Eleusa" (tenderness) type, with the Christ child snuggling up to his mother's cheek.  The "Theotokos" (Greek for Virgin Mary, literally meaning "Birth-Giver of God") is regarded as the holy protectress of Russia.  The icon is displayed in the Tretyakov Gallery, Moscow in a functioning church in the grounds of the museum.  Her feast day is June 23rd o.s. / July 6th n.s. Even more than most famous icons, the original has been copied repeatedly for centuries, and many copies have considerable artistic and religious significance of their own.
Answer: Algirdas