The Simba rebellion, also known as the Orientale revolt, was a regional uprising which took place in the Democratic Republic of the Congo between 1963 and 1965 in the wider context of the Congo Crisis and the Cold War. The rebellion, located in the east of the country, was led by the followers of Patrice Lumumba, who had been ousted from power in 1960 by Joseph Kasa-Vubu and Joseph-Désiré Mobutu and subsequently killed in January 1961 in Katanga. The rebellion was contemporaneous with the Kwilu rebellion led by fellow Lumumbist Pierre Mulele in central Congo.