Ngô Quyền in the context of "Vietnam under Chinese rule"

Haiphong or Hai Phong (Vietnamese: Hải Phòng, pronounced [hǎːj fɔ̀ŋ͡m] ) is the third-largest city in Vietnam and is the principal port city of the Red River Delta. The municipality has an area of 1,526.52 km (589.39 sq mi). The city includes Bạch Long Vĩ and Cát Hải islands in the Gulf of Tonkin. It has a population of 2,130,898 in 2023. The city's economy has strength in manufacturing, as evidenced by large industrial parks and numerous smaller traditional handicraft villages. Historically, Haiphong was the first place in Vietnam and Mainland Southeast Asia to get electricity.

In the imperial era of Đại Việt, the Bạch Đằng River in Haiphong was a place of many legendary victories, led by now-legendary commanders Ngô Quyền and Trần Hưng Đạo. In the 16th century, Mạc dynasty promoted the coastal settlement as a secondary capital, growing to become an important port town of Đàng Ngoài. After the French conquest of Vietnam, in 1888, the president of the French Third Republic, Sadi Carnot, promulgated a decree to establish Haiphong as one of the principal cities of French Indochina. From 1954 to 1975, Haiphong served as the most important maritime city of North Vietnam. It was one of the directly controlled municipalities of a reunified Vietnam with Hanoi and Ho Chi Minh City in 1976.

The Ngô dynasty (Vietnamese: Nhà Ngô; Chữ Nôm: 茹吳), officially Tĩnh Hải quân (chữ Hán: 靜海軍), was a semi-independent Vietnamese dynasty from 939 to 968. The dynasty was founded by Ngô Quyền, who led the Vietnamese forces in the Battle of Bạch Đằng River against the Chinese Southern Han dynasty in 938.

Around 930, as Ngô Quyền rose to power, northern Vietnam was militarily occupied by the Southern Han and was treated as an autonomous province and vassal state of the Later Tang Dynasty, referred to as Tĩnh Hải quân. Every year the Jiedushi of Tĩnh Hải quân had to pay tribute to its Chinese master in exchange for peace and political support. At the beginning of the 10th century, China was domestically plagued and weakened by civil war during what is known as the Five Dynasties and Ten Kingdoms period. The Chinese were preoccupied with these civil struggles and lost their grip on Tĩnh Hải quân periodically. Tĩnh Hải quân took advantage of this opportunity and proclaimed its independence and seceded from China. Under the rule of Lord Protector Dương Đình Nghệ, the Tĩnh Hải quân state initiated a full blown military campaign for independence.