It was written in August 1892
I believe the answer is: Aristotle, Plato, and Socrates
Aristotle and Plato promote the idea of political system and ethical values that later on develop into a democratic system of government that is used by most countries today.
Socrates on the other hand, believe that democracies had a lot of flaw and only a handful of selected people should be able to make the decision for the society, which is what adopted by countris with absolute monarchies.
They invaded africa with armies to capture slaves