Nguyễn dynasty
Rise and expansion under Minh Mạng

Minh Mạng was the younger brother of prince Nguyễn Phúc Cảnh and fourth son of Emperor Gia Long. Educated in Confucian principles from youth, Minh Mạng became the Emperor of Vietnam in 1820, during a deadly cholera outbreak that ravaged and killed 200,000 people across the country. His reign mainly focused on centralizing and stabilizing the state, by abolishing the Viceroy system and implementing a new full bureaucracy-provincial-based administration. He also halted diplomacy with Europe, and cracked down on religious minorities.

Minh Mạng shunned relations with the European powers. By 1824, after the death of Jean Marie Despiau, no Western advisors who had served Gia Long remained in Minh Mạng's court. The last French consul of Vietnam, Eugene Chaigneau, was never able to obtain audience with Minh Mạng. After he left, France ceased attempts at contact. In the next year he launched an anti- Catholicism propaganda campaign, denouncing the religion as "vicious" and full of "false teaching." In 1832 Minh Mạng turned the Cham Principality of Thuận Thành into a Vietnamese province, the final conquest in a long history of colonial conflict between Cham and Vietnam. He coercively fed lizard and pig meat to Cham Muslims and cow meat to Cham Hindus in violation of their religions to forcibly assimilate them to Vietnamese culture. The first Cham revolt for independence took place in 1833–1834 when Katip Sumat, a Cham mullah who had just returned to Vietnam from Mecca declared a holy war (jihad) against the Vietnamese emperor. The rebellion failed to gain the support of the Cham elite and was quickly suppressed by the Vietnamese military. A second revolt began the following year, led by a Muslim clergy named Ja Thak with support from the old Cham royalty, highland people, and Vietnamese dissents. Minh Mạng mercilessly crushed the Ja Thak rebellion and executed the last Cham ruler Po Phaok The in early 1835.

In 1833, as Minh Mạng had been trying to take firm control over the six southern provinces, a large rebellion led by Lê Văn Khôi (an adopted son of the Saigon viceroy Lê Văn Duyệt) broke out in Saigon, attempting to place Minh Mang's brother Prince Cảnh on the throne. The rebellion lasted for two years, gathering much support from Vietnamese Catholics, Khmers, Chinese merchants in Saigon, and even the Siamese ruler Rama III until it was crushed by the government forces in 1835. In January, he issued the first country-wide prohibition of Catholicism, and began persecuting Christians. 130 Christian missionaries, priests and church leaders were executed, dozens of churches were burned and destroyed.
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