Trịnh–Nguyễn War
In 1527, the Vũ Văn clan in [[Hà Giang]] and northern [[Hưng Hóa]] rebelled against Mạc Đăng Dung and set up their own government. [[:zh:武文淵|Vũ Văn Uyên]] and his family rules were called [[:zh:裒主|Bầu Lords]]. In 1534, after Nguyễn Kim forces recaptured Thanh Hóa, Vũ Văn Uyên declared allied with Lê royalists and Ming army to fought against the Mạc Dynasty. But Mạc Đăng Dung himself in 1540 went and surrendered the Ming army, wished for peace. Mạc Đăng Dung ceded the northeast Vietnamese coastal to the [[Ming Dynasty]] for exchanging that the Ming dynasty would never invade Vietnam again. The Chinese now recognized both Mạc and Lê legitimacy over Đại Việt and withdrew their army. Bầu Lords showed strong support for the Lê dynasty and refused to accept Trịnh family at the early stage of Trịnh–Nguyễn War. Later, they cooperated with the Trịnh. Bầu Lords lasted for nearly 200 years from 1527 to 1699.