Trịnh Kiểm
The history of the Nguyễn family began to change drastically after the death of Nguyễn Kim in 1545. After the death of Nguyễn Kim his two sons, Nguyễn Uông and Nguyễn Hoàng, continued to fight the Mạc for the Lê dynasty. However, it was Nguyễn Kim's son-in-law, Trịnh Kiểm, that triggered the event that changed the whole history of Vietnam.