Trịnh Tùng
In 1619, Emperor Lê Kinh Tông, and Tùng's own son, Trịnh Xuân schemed against Trịnh Tùng so the emperor could reclaim actual Imperial power but the plot was discovered, the emperor was forced to garrotte himself and a new emperor was put in his place (Lê Thần Tông). This led Nguyễn Phúc Nguyên to a formal ending of his relations with the court which, after seven more years, led to the Trịnh–Nguyễn War.