During the reigns of the Vietnamese emperors Minh Mạng (1820–41) and Thiệu Trị (1841–47), Catholic missionaries were forbidden to live and work in Vietnam, and several European missionaries who ignored this edict were either banished or, on occasion, executed.
Selama masa pemerintahan kaisar Vietnam, Minh Mạng (1820-41) dan Thiệu Trị (1841-47), para misionaris Katolik dilarang untuk tinggal dan bekerja di Vietnam, dan beberapa misionaris Eropa yang mengabaikan perintah ini diusir atau, kadang-kadang, dieksekusi.