Nobles overthrew most of the city-state monarchs by "750bc".
The ancient Greeks are acclaimed for trying different things with new types of government, may be most prominently majority rules system or democracy. Notwithstanding, well before that, almost every Greek city-state was under the standard of a ruler. Actually, the period of monarchs went on for over a thousand years previously the Greek nobles finished this framework one city-state at once and most changed into oligarchies or legislatures of committees.