 His governance greatly stabilized and helped develop the southern third of Vietnam , turning it into a wealthy and peaceful region . In addition , Duyệt opposed Emperor Minh Mạng 's ascension and defended Christian missionaries and converts from the emperor 's isolationist and Confucian policies . These attitudes brought Duyệt into conflict with Minh Mạng and led to the posthumous desecration of Duyệt 's tomb , which provoked his adopted son Lê Văn Khôi to revolt against the court . Later , Emperor Thiệu Trị , the successor of Minh Mạng , rehabilitated Duyệt and restored his tomb . 
