Question: What was the capital before the Đặng Trần Côn's birth city?

full_context: Document 1: History of Vietnam: After Quang Trung's death, the Tây Sơn dynasty became unstable as the remaining brothers fought against each other and against the people who were loyal to Nguyễn Huệ's infant son. Nguyễn Ánh sailed north in 1799, capturing Tây Sơn's stronghold Qui Nhơn. In 1801, his force took Phú Xuân, the Tây Sơn capital. Nguyễn Ánh finally won the war in 1802, when he sieged Thăng Long (Hanoi) and executed Nguyễn Huệ's son, Nguyễn Quang Toản, along with many Tây Sơn generals and officials. Nguyễn Ánh ascended the throne and called himself Emperor Gia Long. Gia is for Gia Định, the old name of Saigon; Long is for Thăng Long, the old name of Hanoi. Hence Gia Long implied the unification of the country. The Nguyễn dynasty lasted until Bảo Đại's abdication in 1945. As China for centuries had referred to Đại Việt as Annam, Gia Long asked the Manchu Qing emperor to rename the country, from Annam to Nam Việt. To prevent any confusion of Gia Long's kingdom with Triệu Đà's ancient kingdom, the Manchu emperor reversed the order of the two words to Việt Nam. The name Vietnam is thus known to be used since Emperor Gia Long's reign. Recently historians have found that this name had existed in older books in which Vietnamese referred to their country as Vietnam.
Document 2: Ho Chi Minh City: Ho Chi Minh City Thành phố Hồ Chí Minh Saigon or Sài Gòn Municipality Thành phố trực thuộc trung ương Clockwise, from left to right: Bến Thành Market, Ho Chi Minh City Hall, District 1 view from Saigon river, Municipal Theatre, Notre - Dame Cathedral Basilica of Saigon, Independence Palace Seal Nickname (s): Pearl of the Far East Location in Vietnam and Southern Vietnam Coordinates: 10 ° 46 ′ 36.8 ''N 106 ° 42 ′ 02.9'' E ﻿ / ﻿ 10.776889 ° N 106.700806 ° E ﻿ / 10.776889; 106.700806 Coordinates: 10 ° 46 ′ 36.8 ''N 106 ° 42 ′ 02.9'' E ﻿ / ﻿ 10.776889 ° N 106.700806 ° E ﻿ / 10.776889; 106.700806 Country Vietnam Central district District 1 Founded as Gia Định 1698 Renamed to Ho Chi Minh City 1976 Founded by Nguyễn Hữu Cảnh Divisions 19 Urban districts, 5 Suburban districts Government Type Special - class Secretary of Communist Party Nguyễn Thiện Nhân Chairman of People's Committee Nguyễn Thành Phong Chairman of People's Council Nguyễn Thị Quyết Tâm Area Total 2,096.56 km (809.23 sq mi) Elevation 19 m (63 ft) Population (2016) Total 8,426,100 Rank 1st Density 4,000 / km (10,000 / sq mi) GDP (PPP) (2015 estimate) Total US $127.8 billion Per capita US $15,977 GRDP (nominal) (2016) Total US $45.73 billion Per capita US $5,428 Time zone ICT (UTC + 07: 00) Area codes 8 (until 16 Jul 2017) 28 (from 17 Jun 2017) Website hochiminhcity.gov.vn
Document 3: Yunreng: Yunreng was born of the Manchu Aisin Gioro clan as the seventh son of the Kangxi Emperor, but was the second among the emperor's sons to survive into adulthood. He was given the infant name "Baocheng" (保成), and was renamed "Yinreng" when he became older. His mother was the Kangxi Emperor's first empress, Empress Xiaochengren from the Hešeri clan, who was also a granddaughter of Sonin (one of the four regents in the Kangxi Emperor's early reign). She died not long after giving birth to Yinreng, and was greatly lamented by the Kangxi Emperor.
Document 4: Quốc Ân Temple: In the main hall is a banner, containing a verse of praise of the temple and its founder, written by Nguyễn Phúc Chu, one of the Nguyễn lords who once ruled central and southern Vietnam and the city of Huế. The temple is situated on a small hill in the ward of Trường An in the city of Huế. It is located about from the Phú Cam bridge that spans the Perfume River, which passes through Huế.
Document 5: Geography of Vietnam: Vietnam is located on the eastern margin of the Indochinese peninsula and occupies about 331,211.6 square kilometers, of which about 25% was under cultivation in 1987. It borders the Gulf of Thailand, Gulf of Tonkin, and Pacific Sea, alongside China, Laos, and Cambodia. The S - shaped country has a north - to - south distance of 1,650 kilometers and is about 50 kilometers wide at the narrowest point. With a coastline of 3,260 kilometers, excluding islands, Vietnam claims 12 nautical miles (22.2 km; 13.8 mi) as the limit of its territorial waters, an additional 12 nautical miles (22.2 km; 13.8 mi) as a contiguous customs and security zone, and 200 nautical miles (370.4 km; 230.2 mi) as an exclusive economic zone.
Document 6: Trần Nhân Tông: Trần Nhân Tông was born on November 11 of the lunar calendar 1258 as Trần Khâm, the first son of the Emperor Trần Thánh Tông, who had been ceded the throne by Trần Thái Tông for only eight months, and Empress Thiên Cảm Trần Thị Thiều. It was said that the newborn Trần Khâm was so fine that his grandfather Thái Tông and father Thánh Tông named him as Kim Tiên đồng tử (Pupil of the Heavenly Kim Tiên). Prince Trần Khâm was entitled as Crown Prince of the Trần dynasty in December 1274, he had a younger brother, Prince Tá Thiên Trần Đức Việp (born in 1265) and an elder sister, Princess Thiên Thụy, who would die on the same day as her brother Nhân Tông. Always concerned with the education of his son, in 1274, Trần Thánh Tông appointed the prominent mandarin and general Lê Phụ Trần in the position of the crown prince's professor with two famous scholars Nguyễn Sĩ Cố and Nguyễn Thánh Huấn as assistants, the Emperor himself also composed poems and a literary work named "Di hậu lục" to educate prince Trần Khâm.
Document 7: Wen Peng: He was born in Shanghai and raised in Suzhou, the son of painter Wen Zhengming. Employed as a lecturer by the Guozijian (in both Beijing and Nanjing), he was widely regarded as the founder of modern seal-carving. Wen founded the Sanqiao (Wumen) School of seal engraving.
Document 8: Đặng Trần Côn: Đặng Trần Côn was born in Nhân Mục village (or Nhân Mọc), Thanh Trì district, (now Nhân Chính ward, Thanh Xuân district), Hanoi, around 1705-1710. As an adopted child his surname Đặng was that of his adoptive family. His original name was Trần Côn. His work "Chinh phụ ngâm" was written in chữ Hán was later translated into chữ Nôm by the poet Đoàn Thị Điểm and the poet Phan Huy Ích (1751–1822).
Document 9: Đào Duy Từ: After arriving in southern Vietnam, Đào Duy Từ attempted to meet Lord Nguyễn Phúc Nguyên but failed. After that, Từ became a worker for a landlord named Chúc Trịnh Long in Tùng Châu (present day Bồng Sơn, Bình Định Province) in order to get close to Trần Đức Hòa, a neighbor of Chúc Trịnh Long and a mandarin of Lord Nguyễn Phúc Nguyên. This attempt was a success: after leaning of Từ's ability, Trần Đức Hòa gave his daughter's hand to Đào Duy Từ and hired him as the family tutor . At this time, Từ composed a famous Vietnamese language poem, "Ngọa Long Cương Vãng" (Singing of a Lying Dragon), in which he compared himself to famous Chinese military strategist Zhuge Liang.
Document 10: North Vietnam: After about 300 years of partition by feudal dynasties, Vietnam was again under one single authority in 1802 when Gia Long founded the Nguyễn dynasty, but the country became a French protectorate after 1883 and under Japanese occupation after 1940 during World War II. Soon after Japan surrendered on September 2, 1945, the Việt Minh in the August Revolution entered Hanoi, and the Democratic Republic of Vietnam was proclaimed on September 2, 1945: a government for the entire country, replacing the Nguyễn dynasty. Hồ Chí Minh became leader of the Democratic Republic of Vietnam. U.S. President Franklin Roosevelt had spoken against French rule in Indochina, and U.S.A. was supportive of the Viet Minh at this time.
Document 11: French Indochina: A grouping of the three Vietnamese regions of Tonkin (north), Annam (centre), and Cochinchina (south) with Cambodia was formed in 1887. Laos was added in 1893 and the leased Chinese territory of Guangzhouwan in 1898. The capital was moved from Saigon (in Cochinchina) to Hanoi (Tonkin) in 1902 and again to Da Lat (Annam) in 1939. In 1945 it was moved back to Hanoi.
Document 12: France–Vietnam relations: French -- Vietnamese relations started as early as the 17th century with the mission of the Jesuit father Alexandre de Rhodes. Various traders would visit Vietnam during the 18th century, until the major involvement of French forces under Pigneau de Béhaine from 1787 to 1789 helped establish the Nguyễn Dynasty. France was heavily involved in Vietnam in the 19th century under the pretext of protecting the work of Catholic missionaries in the country. France progressively carved for itself a huge colony, which would form French Indochina in 1887. France continued to rule Vietnam as a colony until France's defeat in the First Indochina War and the proclamation of Vietnam's independence in 1954.
Document 13: Đông Anh District: Đông Anh is a rural district ("huyện") of Hanoi, the capital city of Vietnam. Nguyen Phu Trong, current General Secretary of Vietnam since 2011, was born there on 14 April 1944.
Document 14: 3rd Military Region (Vietnam People's Army): The 3rd Military Region of Vietnam People's Army, is directly under the Ministry of Defence of Vietnam, tasked to organise, build, manage and commander armed forces defending the Red River Delta. The north-West region of Vietnam, borders with the Guangxi of China. In 1979, Chinese army with one infantry division, launched an invasion in this military zone.
Document 15: Auguste Henri Vildieu: Auguste Henri Vildieu was the French architectural adjutant in Hanoi while that city was an administrative center for the French colony of Indochina. Vildieu constructed several grand European-style buildings for the colonial government, including:
ground_truth: Saigon
sub_queries: Đặng Trần Côn >> place of birth Answer: Hanoi
Where was the capital before Hanoi ? Answer: Saigon