François-Dominique Toussaint L'Ouverture was the most prominent leader of the Haitian Revolution which began in 1791 and overthrew the French government and then abolished slavery. It was the only slave uprising that was so successful that it led to a country being established.
Even though he was born a slave, L'Ouverture eventually became a free man and was pained by the treatment of enslaved people in Haiti. He led the people to fight the French and when the French asked of negotiations, he went to meet them but they instead captured him and imprisoned him in France where he later died.