The history of Nam Dinh is closely intertwined with the key stages of Vietnam's formation. Its roots go back to the 13th century during the reign of the powerful Tran Dynasty (1225–1400), for whom this land was their ancestral home. A turning point in the city's history came in 1262, when the area known as Tuc Mac was granted the status of the Thien Truong palace and effectively became the second capital of the Dai Viet state. This event turned the region into an important administrative and political center. The city received its official name, meaning "Southern Serenity," much later in 1822 under Emperor Minh Mang.
Several factors contributed to Nam Dinh's rapid rise. First, its high political status under the Tran Dynasty made the city a center of power and the birthplace of many nobles, including national hero Tran Hung Dao. In his honor, the grand Tran Quoc Tuan Monument stands in the city today. Second, its favorable geographic location in the fertile Red River Delta provided the city with resources and made it a strategically important point in the north. Later, in the 20th century, Nam Dinh evolved into one of Vietnam's largest textile industry hubs.
From the very beginning of its ascent, Nam Dinh was not only a political center but also a vital cultural one. The region has long been famous for its high level of education and was considered a land of intellectuals and scholars. Furthermore, it was here that the Vietnamese Buddhist sect Truc Lam was born, founded by King Tran Nhan Tong. Ancient traditions and a drive for knowledge laid a solid foundation for Nam Dinh's reputation as a significant educational center, which it maintains to this day.