Which form of government was first established in Ancient Greece, specifically in Athens?

The first form of government established in Ancient Athens was democracy. This system began to take shape in the early 5th century BCE, with key reforms attributed to leaders like Cleisthenes, who is often called the "Father of Athenian Democracy." Athenian democracy allowed citizens (free male residents) to participate directly in decision-making processes, setting a foundational model for modern democratic systems.