Nguyễn Nhạc
From 1778 to 1788, Nguyễn Nhạc proclaimed himself Emperor Thái Đức ( ). In 1788 after his younger brother proclaimed himself Emperor Quang Trung, Nguyễn Nhạc resigned his Emperor title and declared himself as King of Tây Sơn. Nguyễn Nhạc and his brothers, namely Nguyễn Lữ and Nguyễn Huệ, known as the Tây Sơn Brothers, ended the centuries-long civil war between the two feudal families- the Trịnh Lords in northern Vietnam and the Nguyễn Lords in southern Vietnam, seizing reigning power from these groups and the Lê dynasty.