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.
History of Slavery in Nigeria Although local slavery was officially prohibited by the colonial British administration from the mid-1880s, they tacitly permitted it to continue well into the 1930s, ending completely only in the 1940s.