Trịnh Kiểm
In 1545, Nguyễn Kim was assassinated. One logical successor to the leadership of the Nguyễn-Trịnh alliance was his eldest son, Nguyễn Uông but instead, Uông was killed and Trịnh Kiểm took control. The younger son Nguyễn Hoàng was sent to the far south to administer the newer province of Ô-châu (modern Quảng-bình to Quảng-nam), in what used to be Champa lands. Governing from the new city of Phú Xuân (modern Huế), the Nguyễn lord, under Nguyễn Hoàng, slowly expanded their control to the south while the Trịnh lords waged their war for control over the north of Vietnam.