Answer:
Tyrants served in a transitional role from oligarchy to democracy for many city-states.
Step-by-step explanation:
Oligarchs are members of small groups that control power. Such a group is called an Oligarchy.
In ancient Greece, the oligarchs were wealthy aristocrats with lots of inherited wealth who ruled the people of Greece forcefully and through fear. They did not consider the needs of the people and focused on acquiring more wealth for themselves.
Tyrants in ancient Greece overthrew the Oligarchs and eliminated Oligarchy. They were responsible for bringing about democracy in most city states.