Question: Who fathered the leader of the first expedition to reach Asia by sailing west across the ocean serving as the mouth of the river the Salmonberry River flows into?

full_context: Document 1: Oregon: Oregon (/ ˈɔːrɪɡən / (listen)) is a state in the Pacific Northwest region on the West coast of the United States. The Columbia River delineates much of Oregon's northern boundary along Washington state, while the Snake River delineates much of its eastern boundary along Idaho. The parallel 42 ° north delineates the southern boundary with California and Nevada. Oregon is one of only three states of the contiguous United States to have a coastline on the Pacific Ocean.
Document 2: Nevill Bay: Nevill Bay is a long and narrow waterway in Kivalliq Region, Nunavut, Canada. It is located in northwestern Hudson Bay between Rankin Inlet and Whale Cove, approximately south of Tavani. The Ferguson River empties into the bay opposite Bibby Island.
Document 3: Salloomt River: The Salloomt River is a river in the Bella Coola Valley of the Central Coast region of British Columbia, Canada. It is a tributary of the Bella Coola River, flowing southwest out of the southernmost Kitimat Ranges to meet that river just upstream from the community of Hagensborg.
Document 4: Sustut River: The Sustut River is a major tributary of the Skeena River in the north-central Interior of British Columbia, Canada. It forms the northwest boundary of the Hogem Ranges and flows southwest to meet the Skeena, north of Hazelton. Originally named the Bear Wallow River, its headwaters are at Sustut Lake, northwest of Germansen Landing (at ; Sustut Lake was similarly named Bear Wallow Lake).
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: Salmonberry River: The Salmonberry River is a tributary of the Nehalem River, about long, in northwest Oregon in the United States. It drains a remote unpopulated area of the Northern Oregon Coast Range in the Tillamook State Forest about west-northwest of Portland. The river runs through part of the region devastated between 1933 and 1951 by a series of wildfires known as the Tillamook Burn.
Document 7: 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 8: Naselle, Washington: Naselle is a census-designated place (CDP) in Pacific County, Washington, United States. The population was 419 at the 2010 census. Though very near Columbia River's estuary, the valley's Naselle River flows west into nearby Willapa Bay and then into the Pacific Ocean. Close about the town lie the evergreen-covered Willapa Hills. The river's name has been spelled Nasel and Nasal. An early settler along the river called it the Kenebec. The name comes from the Nisal Indians, a Chinookan tribe formerly residing on the river.
Document 9: 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 10: Nehalem Bay: Nehalem Bay is a bay formed by the confluence of the Nehalem River with the Pacific Ocean in northern Oregon, United States.
Document 11: 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 12: 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 13: 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 14: 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 15: Sweet Home Valley: The Sweet Home Valley of the South Santiam River runs from an area known as The Narrows near the western edge of the city of Sweet Home, Oregon to the confluence of the South Santiam and Middle Santiam rivers at Foster Reservoir on the east. Extending on either side of the South Santiam, nearly all of the valley south of the river is inside the city of Sweet Home while the valley north of the river remains unincorporated. Prior to the construction of Foster Dam, the area inundated by Foster Reservoir was occupied by several ranches and farms.
ground_truth: Estêvão da Gama
sub_queries: What does Salmonberry River flow into? Answer: Nehalem River
Nehalem River >> mouth of the watercourse Answer: Pacific Ocean
who led the first expedition to reach asia by sailing west across Pacific Ocean Answer: Vasco da Gama
Who fathered Vasco da Gama ? Answer: Estêvão da Gama