Question: Who was the first national leader of the country that includes Niemba?

full_context: Document 1: Niemba: Niemba is a town in the Democratic Republic of Congo, Katanga Province. It is situated on the Lukuga River, a tributary of the Lualaba river. The population is around 1,800. It is connected by rail to Kalemie.
Document 2: Republic of the Congo: The region was dominated by Bantu-speaking tribes, who built trade links leading into the Congo River basin. Congo-Brazzaville was formerly part of the French colony of Equatorial Africa. Upon independence in 1960, the former colony of French Congo became the Republic of the Congo. The People's Republic of the Congo was a Marxist–Leninist one-party state from 1970 to 1991. Multi-party elections have been held since 1992, although a democratically elected government was ousted in the 1997 Republic of the Congo Civil War and President Denis Sassou Nguesso has ruled for 26 of the past 36 years.
Document 3: Republic of the Congo: The region was dominated by Bantu-speaking tribes at least 3,000 years ago, who built trade links leading into the Congo River basin. Congo was formerly part of the French colony of Equatorial Africa. The Republic of the Congo was established on the 28th of November 1958 but gained independence from France in 1960. The sovereign state has had multi-party elections since 1992, although a democratically elected government was ousted in the 1997 Republic of the Congo Civil War, and President Denis Sassou Nguesso, who first came to power in 1979, has ruled for 35 of the past 40 years.
Document 4: Yumbi: Yumbi is a town and territory in Plateaux District of Bandundu Province in the Democratic Republic of the Congo. It lies on the eastern bank of the Congo River between Bolobo and Lukolela.
Document 5: Luberizi: Luberizi is a town in the province of South Kivu of the Democratic Republic of Congo. At an elevation of 957 metres, it has a local population of about 25,462. It sits astride the N5 road where it crosses the Luberizi River, nearly midway between Uvira to the south and Bukavu to the north.
Document 6: Luvua River: The Luvua River (or "Lowa River") is a river in the Katanga Province of the Democratic Republic of the Congo (DRC). It flows from the northern end of Lake Mweru on the Zambia-Congo border in a northwesterly direction for to its confluence with the Lualaba River opposite the town of Ankoro. The Lualaba becomes the Congo River below the Boyoma Falls.
Document 7: Republic of the Congo: Following the revision of the French constitution that established the Fifth Republic in 1958, the AEF dissolved into its constituent parts, each of which became an autonomous colony within the French Community. During these reforms, Middle Congo became known as the Republic of the Congo in 1958 and published its first constitution in 1959. Antagonism between the pro-Opangault Mbochis and the pro-Youlou Balalis resulted in a series of riots in Brazzaville in February 1959, which the French Army subdued.
Document 8: Kalima, Democratic Republic of the Congo: Kalima is a town in Maniema Province, Congo. It is situated northeast of the provincial capital Kindu, between the Ulindi River and the Elila River, at an altitude of 2797 ft (852 m). The economic activity of Kalima and the surrounding area includes tin mining. In 2003 the town saw attacks by the Mai-Mai militias. Kalima has a hospital and is served by Kalima Airport.
Document 9: Republic of the Congo: The Republic of the Congo received full independence from France on August 15, 1960. Fulbert Youlou ruled as the country's first president until labour elements and rival political parties instigated a three-day uprising that ousted him. The Congolese military took charge of the country briefly and installed a civilian provisional government headed by Alphonse Massamba-Débat.
Document 10: Republic of the Congo: Pascal Lissouba, who became Congo's first elected president (1992–1997) during the period of multi-party democracy, attempted to implement economic reforms with IMF backing to liberalise the economy. In June 1996 the IMF approved a three-year SDR69.5m (US$100m) enhanced structural adjustment facility (ESAF) and was on the verge of announcing a renewed annual agreement when civil war broke out in Congo in mid-1997.
Document 11: Republic of the Congo: Under the 1963 constitution, Massamba-Débat was elected President for a five-year term. During Massamba-Débat's term in office the regime adopted "scientific socialism" as the country's constitutional ideology. In 1965, Congo established relations with the Soviet Union, the People's Republic of China, North Korea and North Vietnam. Massamba-Débat's regime also invited several hundred Cuban army troops into the country to train his party's militia units and these troops helped his government survive a coup in 1966 led by paratroopers loyal to future President Marien Ngouabi. Nevertheless, Massamba-Débat was unable to reconcile various institutional, tribal and ideological factions within the country and his regime ended abruptly with a bloodless coup d'état in September 1968.
Document 12: Lubao, Democratic Republic of the Congo: Lubao is a town and territory in Kabinda District, Kasai-Oriental Province, Democratic Republic of the Congo. It lies near the eastern bank of the Lomami River.
Document 13: Lusanga, Kwango: Lusanga is a town in the Kwango Province of the Democratic Republic of the Congo. The town is situated approximately 20 miles north of the Angolan border, and the same distance west of the Kwango River. It lies northeast of the town of Popokabaka. There is also another town called Lusanga in Kwilu District of Bandundu province, to the north of Kikwit.
Document 14: History of the Democratic Republic of the Congo: After an uprising by the Congolese people, Belgium surrendered to the independence of the Congo in 1960. However, the Congo remained unstable because tribal leaders had more power than the central government. Prime Minister Patrice Lumumba tried to restore order with the aid of the Soviet Union as part of the Cold War, causing the United States to support a coup led by Colonel Joseph Mobutu in 1965. Mobutu quickly seized complete power of the Congo and renamed the country Zaire. He sought to Africanize the country, changing his own name to Mobutu Sese Seko, and demanded that African citizens change their Western names to traditional African names. Mobutu sought to repress any opposition to his rule, in which he successfully did throughout the 1980s. However, with his regime weakened in the 1990s, Mobutu was forced to agree to a power - sharing government with the opposition party. Mobutu remained the head of state and promised elections within the next two years that never took place.
Document 15: Nyangwe: Nyangwe is a town in Maniema, on the right bank of the Lualaba in the Democratic Republic of Congo (territory of Kasongo). It was an important hub for the Arabs for trade goods like ivory and also one of the main slave trading states in the region at the end of the 19th century.
ground_truth: Fulbert Youlou
sub_queries: Niemba >> country Answer: Congo
Who was the first leader of the independent Congo ? Answer: Fulbert Youlou