The best example of tyranny is an emperor who forces citizens to give all their money for his new crown, demonstrating an egregious abuse of power reminiscent of absolute monarchies or dictatorships.
Tyranny is the abuse of power by someone in charge, such as a king or emperor. The BEST example of tyranny among the provided options is an emperor who forces all the citizens to give all their money to pay for his new crown. This act is a gross abuse of power, where the ruler exerts absolute control over the populace to satisfy personal desires at the expense of the citizens' well-being. This is akin to the behavior of an absolute monarch or a dictator who might use economic and military might, intimidation, and brutality to stay in power, often curtailing the liberties of individuals and being unresponsive to their needs.