After the expulsion of the tyrants, an oligarchy (rule by the upper class) called the Council of the Areopagus replaced them. In 508 BCE Cleisthenes led a move to a more broadly-based government with a popular assembly, which was the beginning of democratic government.
After the Persian Wars, the positive leadership of the Council in organising resistance to the invasion re-established much of the Council's authority, setting back democratic reforms. This was eventually countered by Ephialtes in 461 BCE, who successfully re-entrenched the popular assembly as controlling the government, and finally disempowered the Council of the Areopagus.
He was assassinated for this, and the lead role was taken over by Pericles, who took the democracy further - the popular Assembly met every fortnight to direct affairs, and office-bearers were to be selected by lot, which meant that any citizen could become the top magistrates and other civic appointments. Wisely, the generals were elected by the tribes, as no-one wanted to go into battle led by some donkey whose name came out of the hat, and the popular assembly often added to its decisions 'and the generals will see to it' on civil as well as military matters, just to make sure it was actioned by a responsible person.
Because the tyrants forced a traded democracy.
The Tyrants were in charge of Athens
First kings, then oligarchs, then tyrants, then by the citizens.
spartans have the control in athens
the Athens and the Spartans dmm
tyrants
Its government was a early form of democracy and it was goverened by tyrants {p.s. Athens is in Greece not Rome}
the Thirty Tyrants
Pro-Spartan rulers in Athens after the loss of the Peloponnesian War in 404 BC.
Athens had an internal dispute bordering on civil war between its different classes of people - essentially against the ruling aristocracy. The tyrants were brought in by popular acclaim to establish a government which looked after all citizens, not just the interests of a few.
Oligarchy
First the kings, who were replaced by the oligarchs, who were replaced by the tyrants, who were replaced by the demagogues under the democracy