The Vietnamese invasions of Cambodia refers to the period of Cambodian history, between 1813 and 1845, when the Kingdom of Cambodia was invaded by the Kingdom of Vietnam three times, and a brief period from 1834 to 1841 when Cambodia was part of Tây Thành province in Vietnam, undertaken by Vietnamese emperors Gia Long (r. 1802–1819) and Minh Mạng (r. 1820–1841). The first invasion that took place in 1811-1813 put Cambodia as Vietnam's client kingdom. The second invasion in 1833–1834 made Cambodia a de facto Vietnamese province. Minh Mạng's harsh rule of the Cambodians finally ended after he died in early 1841, an event which coincided with a Cambodian rebellion, and both which triggered a Siamese intervention in 1842. The unsuccessful third invasion of 1845 resulted in the independence of