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 "Second Empire of Haiti"): It was established by the then-President, former slave Faustin Soulouque, who, inspired by Napoleon I, declared himself Emperor Faustin I of Haiti on August 26, 1849 at the Cathedral of Our Lady of the Assumption in Port-au-Prince.
Relevant evidence: No