明命帝
On 12 January 1825, Hyacinthe de Bougainville led an embassy to Vietnam with Captain Courson de la Ville-Hélio, arriving in Da Nang, with the warships "Thétis" and "Espérance". Although they had numerous presents for the Emperor, and a 28 January 1824 letter from Louis XVIII, the ambassadors could not obtain an audience from Minh Mạng. Hyacinthe de Bougainville infiltrated Father Regéreau from the "Thétis" when it was anchored in Da Nang, triggering edicts of persecution against Christianity by Minh Mạng.