A form of government which has its slogan to be 'ruling of the best' is

The form of government that has the slogan of 'ruling of the best' is Aristocracy. Aristocracy is a type of government where a small group of privileged individuals hold power, typically based on their wealth, social status, or intelligence. The term "aristocracy" comes from the Greek words "aristos," which means "best," and "kratos," which means "rule." The idea behind aristocracy is that those who are deemed to be the best and most capable individuals should be the ones to lead the government and make decisions on behalf of the people. This is in contrast to democracy, where power is held by the people as a whole, and decisions are made through a process of popular vote.