Minh Mạng
Hoàng Kế Viêm (1820–1909) was a son-in-law of emperor Minh Mạng. His father is Hoàng Kim Xán, the governor of province Khánh Hòa. In the year 1841, Emperor Minh Mạng died, and his eldest son Thiệu Trị succeeded to the throne.