Ubangi District (, ) was a district of the Congo Free State, Belgian Congo and Democratic Republic of the Congo. It went through various significant changes in extent. Congo Free State A decree of 1 August 1888 divided the Congo Free State into eleven districts, of which the first five were in the lower Congo region: Ubangi-Uélé District had its capital at Nouvelle Anvers. In 1895 the number of the districts was increased to fifteen, including Ubangi District and Uele District. An 1897 map of the Congo Free State showed Ubangi District as a long strip along the northwest border of the colony, on the left bank of the Ubangi River, which defined the border down to its confluence with the Congo River. Bangalas District was to the south and Uellé District was to the east. In 1892 King Leopold II of Belgium declared that the Ubangi River basin and other parts of the Congo Free Statey were private domains of the state, although exploitation of rubber in parts of these domains by specific companies was allowed. Reports of missionaries show that working conditions imposed on the populations by the rubber companies was harsh and almost inhuman. Lieutenant Louis Royaux was appointed to the Ubangi District in April 1896, responsible for exploiting rubber in the district. He reached Ubangi in April 1897, and first had to reoccupy the Imesse post in south Ubangi, and build a station on the site of the former village of Libenge, which would become the district capital. Royaux reached Banzyville territory in December 1898, but before starting rubber production had to recruit as many men as possible to fight the Batetela in Uele, who had been in rebellion since 1897. Royaux spent 1900 teaching each village about rubber harvesting, despite the insistence of the Ngbandi that there were no lianas and rubber trees in their forests. It turned out that the region was indeed poor in rubber, requiring villagers to cover long distances to places where rubber could be harvested. A skilled worker could collect perhaps of rubber in a month. In a series of atrocities, police detachments killed many villagers who had revolted, or had failed to meet their quotas. Many people fled across the river to French territory, and did not return. Those who remained were vulnerable to sickness and were impoverished since the men did not have time to work the fields,