As the prohibition proved largely ineffective, and missionaries continued their activities in Vietnam, especially under the protection of the governor of Cochinchina Lê Văn Duyệt, a total ban on Roman Catholicism as well as French and Vietnamese priests was enacted following their support of the Lê Văn Khôi revolt (1833–1835), leading to persecutions of French missionaries and the execution of Father Joseph Marchand in 1835. These events fed in France a desire to intervene and protect the Roman Catholic faith.