Lê Lợi in the context of "Thăng Long"

Hanoi (/hæˈnɔɪ/ han-OY; Vietnamese: Hà Nội [hàː nôjˀ] ) is the capital and second-most populous city of Vietnam. The name "Hanoi" translates to "inside the river" (Hanoi is bordered by the Red and Black Rivers). The city encompasses an area of 3,358.6 km (1,296.8 sq mi), and as of 2025 has a population of 8,807,523. Hanoi had the second-highest gross regional domestic product of all Vietnamese provinces and municipalities at US$48 billion in 2023, behind only Ho Chi Minh City.

In the third century BCE, the Cổ Loa Capital Citadel of Âu Lạc was constructed in what is now Hanoi. Âu Lạc then fell under Chinese rule for a thousand years. In 1010, under the Lý dynasty, Vietnamese emperor Lý Thái Tổ established the capital of the imperial Vietnamese nation Đại Việt in modern-day central Hanoi, naming the city Thăng Long [tʰɐŋ loŋ], 'ascending dragon'). In 1428, King Lê Lợi renamed the city to Đông Kinh [ɗoŋ kīŋ̟], 'eastern capital'), and it remained so until 1789. The Nguyễn dynasty in 1802 moved the national capital to Huế and the city was renamed Hanoi in 1831. It served as the capital of French Indochina from 1902 to 1945 and French protectorate of Tonkin from 1883 to 1949. After the August Revolution and the fall of the Nguyễn dynasty, the Democratic Republic of Vietnam (DRV) designated Hanoi as the capital of the newly independent country. From 1949 to 1954, it was part of the State of Vietnam. It was again part of the DRV ruling North Vietnam from 1954 to 1976. In 1976, it became the capital of the unified Socialist Republic of Vietnam. In 2008, Hà Tây Province and two other rural districts were annexed into Hanoi, almost tripling Hanoi's area.

Nguyễn Trãi (阮廌), pen name Ức Trai (抑齋); (1380–1442) was an illustrious Vietnamese Confucian scholar, a noted poet, a skilled politician and a master strategist. He was at times attributed with being capable of almost miraculous or mythical deeds in his designated capacity as a principal advisor of Lê Lợi, who fought against the Ming dynasty. He is credited with writing the important political statements of Lê Lợi and inspiring the Vietnamese populace to support open rebellion against the Ming dynasty rulers. He is also the author of "Great Proclamation upon the Pacification of the Wu" (Bình Ngô đại cáo).

Bình Ngô đại cáo (chữ Hán: 平吳大誥, literally: Great proclamation upon the pacification of the Wu) was an announcement written by Nguyễn Trãi in 1428, at Lê Lợi's behest and on Lê Lợi's behalf, to proclaim the Lam Sơn's victory over the Ming imperialists and affirm the independence of Đại Việt to its people. The document was written in Classical Chinese.

The Lê dynasty, also known in historiography as the Later Lê dynasty (Vietnamese: "Nhà Hậu Lê" or "Triều Hậu Lê", chữ Hán: 朝後黎, chữ Nôm: 茹後黎), officially Đại Việt (Chữ Hán: 大越), was the longest-ruling Vietnamese dynasty, having ruled from 1428 to 1789, with an interregnum between 1527 and 1533. The Lê dynasty is divided into two historical periods: the Initial Lê dynasty (Vietnamese: triều Lê sơ, chữ Hán: 朝黎初, or Vietnamese: nhà Lê sơ, chữ Nôm: 茹黎初; 1428–1527) before the usurpation by the Mạc dynasty, in which emperors ruled in their own right, and the Revival Lê dynasty (Vietnamese: triều Lê Trung hưng, chữ Hán: 朝黎中興, or Vietnamese: nhà Lê trung hưng, chữ Nôm: 茹黎中興; 1533–1789), in which the emperors were figures who reigned under the auspices of the powerful Trịnh family. The Revival Lê dynasty was marked by two lengthy civil wars: the Lê–Mạc War (1533–1592) in which two dynasties battled for legitimacy in northern Vietnam and the Trịnh–Nguyễn Wars (1627–1672, 1774–1777) between the Trịnh lords in North and the Nguyễn lords of the South.

The dynasty officially began in 1428 with the enthronement of Lê Lợi after he drove the Ming Chinese army from Vietnam. The dynasty reached its peak during the reign of Lê Thánh Tông and declined after his death in 1497. In 1527, the Mạc dynasty usurped the throne; when the Lê dynasty was restored in 1533, the Mạc fled to the far north and continued to claim the throne during the period known as Southern and Northern Dynasties. The restored Lê emperors held no real power, and by the time the Mạc dynasty was finally eradicated in 1677, actual power lay in the hands of the Trịnh lords in the North and Nguyễn lords in the South, both ruling in the name of the Lê emperor while fighting each other. The Lê dynasty officially ended in 1789, when the peasant uprising of the Tây Sơn brothers defeated both the Trịnh and the Nguyễn, ironically in order to restore power to the Lê dynasty.