Question: Who is the father of the person who led the first expedition to reach the continent where Chelyabinsk is found by sailing west across the ocean along eastern Russia?

full_context: Document 1: Chronology of European exploration of Asia: 1497 - 1499 The Portuguese Vasco da Gama, accompanied by Nicolau Coelho and Bartolomeu Dias, is the first European to reach India by an all - sea route from Europe.
Document 2: Russian Soviet Federative Socialist Republic: The Russian Soviet Federative Socialist Republic (Russian SFSR or RSFSR; Russian: Российская Советская Федеративная Социалистическая Республика, tr. Rossiyskaya Sovetskaya Federativnaya Sotsialisticheskaya Respublika  listen (help·info)) commonly referred to as Soviet Russia or simply as Russia, was a sovereign state in 1917–22, the largest, most populous, and most economically developed republic of the Soviet Union in 1922–91 and a sovereign part of the Soviet Union with its own legislation in 1990–91. The Republic comprised sixteen autonomous republics, five autonomous oblasts, ten autonomous okrugs, six krais, and forty oblasts. Russians formed the largest ethnic group. To the west it bordered Finland, Norway and Poland; and to the south, China, Mongolia and North Korea whilst bordering the Arctic Ocean to the north, the Pacific Ocean to the east and the Black sea and Caspian Sea to the south. Within the USSR, it bordered the Baltic republics (Lithuania, Latvia and Estonia), the Byelorussian SSR and the Ukrainian SSR to the west. To the south it bordered the Georgian, Azerbaijan and Kazakh SSRs.
Document 3: Chronology of European exploration of Asia: The Portuguese Vasco da Gama, accompanied by Nicolau Coelho and Bartolomeu Dias, is the first European to reach India by an all - sea route from Europe.
Document 4: Ulyanovsk Oblast: Ulyanovsk Oblast (Russian: Улья́новская о́бласть, Ulyanovskaya oblast) is a federal subject of Russia (an oblast). It is located in the Volga Federal District. Its administrative center is the city of Ulyanovsk. Population: 1,292,799 (2010 Census).
Document 5: Vasco da Gama: Vasco da Gama, 1st Count of Vidigueira (Portuguese pronunciation: (ˈvaʃku ðɐ ˈɣɐmɐ); c. 1460s -- 24 December 1524), was a Portuguese explorer and the first European to reach India by sea. His initial voyage to India (1497 -- 1499) was the first to link Europe and Asia by an ocean route, connecting the Atlantic and the Indian oceans and therefore, the West and the Orient.
Document 6: Vasco Joaquim Rocha Vieira: Vasco Joaquim Rocha Vieira, (;b. Lagoa, Portugal, born on 16 August 1939), is a retired Portuguese Army officer who was last Governor of Macau.
Document 7: Portuguese discovery of the sea route to India: The discovery of the sea route to India is the description sometimes used in Europe and among the Portuguese for the first recorded trip made directly from Europe to India via the Atlantic Ocean. It was undertaken under the command of Portuguese explorer Vasco da Gama during the reign of King Manuel I in 1497 - 1499. Considered by Europe to be one of the most remarkable voyages of the Age of Discovery, it consolidated the Portuguese maritime presence in Indian Ocean and that country's dominance of global trade routes.
Document 8: Antonio Possevino: Recent scholarship has identified Antonio Possevino's family as New Christians admitted to the learned circles of the court of Renaissance Mantua and its Gonzaga dukes. His father was Piedmontese from Asti and moved to Mantua where he joined the guild of goldsmiths. The family name was changed from Cagliano (Caliano) and had three sons, Giovanni Battista, Antonio and Giorgio. His mother nursed her son Antonio in 1533 together with Francesco III Gonzaga, Duke of Mantua.
Document 9: Vasco da Gama: Vasco da Gama's father was Estêvão da Gama, who had served in the 1460s as a knight of the household of Infante Ferdinand, Duke of Viseu. He rose in the ranks of the military Order of Santiago. Estêvão da Gama was appointed "alcaide-mór" (civil governor) of Sines in the 1460s, a post he held until 1478; after that he continued as a receiver of taxes and holder of the Order's commendas in the region.
Document 10: Portuguese India: The first viceroy, Francisco de Almeida, established his headquarters in Cochin (Cochim, Kochi). Subsequent Portuguese governors were not always of viceroy rank. After 1510, the capital of the Portuguese viceroyalty was transferred to Goa. Until the 18th century, the Portuguese governor in Goa had authority over all Portuguese possessions in the Indian Ocean, from southern Africa to southeast Asia. In 1752 Mozambique got its own separate government and in 1844 the Portuguese Government of India stopped administering the territory of Macau, Solor and Timor, and its authority was confined to the colonial holdings on the Malabar coast of present - day India.
Document 11: Russia: Russia (/ ˈrʌʃə / (listen); Russian: Росси́я, tr. Rossiya; IPA: (rɐˈsjijə)), also officially known as the Russian Federation (Russian: Российская Федерация, tr. Rossiyskaya Federatsiya; IPA: (rɐˈsijskəjə fjɪdjɪˈratsɨjə)), is a country in Eurasia. At 17,125,200 square kilometres (6,612,100 sq mi), Russia is the largest country in the world by surface area, covering more than one - eighth of the Earth's inhabited land area, and the ninth most populous, with over 144 million people at the end of March 2016. The European western part of the country is much more populated and urbanised than the eastern; about 77% of the population live in European Russia. Russia's capital Moscow is one of the largest cities in the world; other major urban centers include Saint Petersburg, Novosibirsk, Yekaterinburg, Chelyabinsk, Nizhny Novgorod, Ufa, and Kazan.
Document 12: Russian Soviet Federative Socialist Republic: On December 30, 1922, with the creation of the Soviet Union, Russia became one of six republics within the federation of the Union of Soviet Socialist Republics. The final Soviet name for the republic, the Russian Soviet Federative Socialist Republic, was adopted in the Soviet Constitution of 1936. By that time, Soviet Russia had gained roughly the same borders of the old Tsardom of Russia before the Great Northern War of 1700.
Document 13: Chelyabinsk: Chelyabinsk () is a city and the administrative center of Chelyabinsk Oblast, Russia, located in the northeast of the oblast, south of Yekaterinburg, just to the east of the Ural Mountains, on the Miass River, on the border of Europe and Asia. Population:
Document 14: Russian Soviet Federative Socialist Republic: Internationally, in 1920, the RSFSR was recognized as an independent state only by Estonia, Finland, Latvia and Lithuania in the Treaty of Tartu and by the short-lived Irish Republic.
Document 15: Russian Soviet Federative Socialist Republic: For most of the Soviet Union's existence, it was commonly referred to as "Russia," even though technically "Russia" was only one republic within the larger union—albeit by far the largest, most powerful and most highly developed.
ground_truth: Estêvão da Gama
sub_queries: What is the continent of Chelyabinsk? Answer: Asia
Which ocean is along eastern Russia? Answer: the Pacific Ocean
who led the first expedition to reach Asia by sailing west across #2 Answer: Vasco da Gama
Who fathered Vasco da Gama ? Answer: Estêvão da Gama