Question: Cap-Haïtien became the capital of the Kingdom of Northern Haiti under a king that was a former slave of what ethnicity?
Sentence (from "Henri Christophe"): Henri Christophe (] ; 6 October 1767 – 8 October 1820; used the anglicized version of Henry Christopher) was a former slave of Bambara ethnicity, and perhaps of Ibo descent, and key leader in the Haitian Revolution, which succeeded in gaining independence from France in 1804.
Relevant evidence: Yes