 Duyệt 's death opened the way for Minh Mạng to apply his policies in the south , as the viceroy 's subordinates lacked the influence to defy the court . The emperor also tried to reduce Duyệt 's followers ’ political power by abolishing the post of viceroy and putting the south under his direct rule , thus making Duyệt the last holder of the post . Soon after Duyệt 's death , Minh Mạng 's new appointees arrived and took over the local administration . The new officials then launched an investigation and reported that Duyệt and his aides had engaged in corrupt and abusive practices . 
