Napoleon ended lawlessness and disorder in post-Revolutionary France. He was, however, considered a tyrant and usurper by his opponents. His critics charge that he was not significantly troubled when faced with the prospect of war and death for thousands, turned his search for undisputed rule into a series of conflicts throughout Europe and ignored treaties and conventions alike. His role in the Haitian Revolution and decision to reinstate slavery in France's oversea colonies are controversial and have an impact on his reputation.

Answer this question, if possible (if impossible, reply "unanswerable"): Napoleon's role in which revolution has caused controversy regarding his reputation?
the Haitian Revolution