City-states in the context of "Republic of Florence"

During the Classical era and Hellenistic era of Classical Antiquity, many Hellenic city-states had adopted democratic forms of government, in which free (non-slave), native (non-foreigner) adult male citizens of the city took a major and direct part in the management of the affairs of state, such as declaring war, voting supplies, dispatching diplomatic missions and ratifying treaties. These activities were often handled by a form of direct democracy, based on a popular assembly. Others, of judicial and official nature, were often handled by large juries, drawn from the citizen body in a process known as sortition.

By far the most well-documented and studied example is the Athenian democracy in Athens. However, there are documented examples of at least fifty-two Greek city-states including Corinth, Megara, and Syracuse that also had democratic regimes during part of their history. According to Ober (2015), the proportion of Greek city-states with democratic regimes gradually increased from the mid 6th century BC to the end of the 4th century BC, when perhaps half of the one-thousand Greek city-states in existence at the time had democratic regimes.

Fifth-century Athens was the Greek city-state of Athens in the time from 480 to 404 BC. Formerly known as the Golden Age of Athens, the latter part being the Age of Pericles, it was buoyed by political hegemony, economic growth and cultural flourishing. The period began in 478 BC, after the defeat of the Persian invasion, when an Athenian-led coalition of city-states, known as the Delian League, confronted the Persians to keep the liberated Asian Greek cities free.

After peace was made with Persia in the mid-5th century BC, what started as an alliance of independent city-states became an Athenian empire after Athens abandoned the pretense of parity among its allies and relocated the Delian League treasury from Delos to Athens, where it funded the building of the Athenian Acropolis, put half its population on the public payroll, and maintained its position as the dominant naval power in the Greek world.

Macedonia (/ˌmæsɪˈdoʊniə/ MASS-ih-DOH-nee-ə; Greek: Μακεδονία, Makedonía), also called Macedon (/ˈmæsɪdɒn/ MASS-ih-don), was an ancient kingdom on the periphery of Archaic and Classical Greece, which later became the dominant state of Hellenistic Greece. The kingdom was founded and initially ruled by the royal Argead dynasty, which was followed by the Antipatrid and Antigonid dynasties. Home to the ancient Macedonians, the earliest kingdom was centred on the northeastern part of the Greek peninsula, and bordered by Epirus to the southwest, Illyria to the northwest, Paeonia to the north, Thrace to the east and Thessaly to the south.

Before the 4th century BC, Macedonia was a small kingdom with its capital at Aigai, outside of the area dominated by the great city-states of Athens, Sparta and Thebes, and briefly subordinate to the Achaemenid Empire. During the reign of the Argead king Philip II (359–336 BC), Macedonia (with its capital at Pella) subdued mainland Greece and the Thracian Odrysian kingdom through conquest and diplomacy. With a reformed army containing phalanxes wielding the sarissa pike, Philip II defeated the old powers of Athens and Thebes in the Battle of Chaeronea in 338 BC. Philip II's son Alexander the Great, leading a federation of Greek states, accomplished his father's objective of commanding the whole of Greece when he destroyed Thebes after the city revolted. During Alexander's subsequent campaign of conquest, he overthrew the Achaemenid Empire and conquered territory that stretched as far as the Indus River. For a brief period, his Macedonian Empire was the most powerful in the world – the definitive Hellenistic state, inaugurating the transition to a new period of Ancient Greek civilization. Greek arts and literature flourished in the new conquered lands and advances in philosophy, engineering, and science spread across the empire and beyond. Of particular importance were the contributions of Aristotle, tutor to Alexander, whose writings became a keystone of Western philosophy.

Magna Graecia was the historical Greek-speaking area of southern Italy. It encompassed the modern Italian regions of Calabria, Apulia, Basilicata, Campania, and Sicily. These regions were extensively settled by Greeks beginning in the 8th century BC.

Initially founded by their metropoleis (mother cities), the settlements evolved into independent and powerful Greek city-states (poleis). The settlers brought with them Hellenic civilization, which over time developed distinct local forms due to both their distance from Greece and the influence of the indigenous peoples of southern Italy. This interaction left a lasting imprint on Italy, including on Roman culture. The Greek settlers also influenced native groups such as the Sicels and the Oenotrians, many of whom adopted Greek culture and became Hellenized. In areas like architecture and urban planning, the colonies sometimes surpassed the achievements of the motherland. The ancient inhabitants of Magna Graecia are referred to as Italiotes and Siceliotes.

The Etruscans (/ɪˈtrʌskən/ ih-TRUS-kən) created a civilization in Etruria in ancient Italy, with a common language and culture, and formed a federation of city-states. After adjacent lands had been conquered, its territory covered, at its greatest extent, roughly what is now Tuscany, western Umbria and northern Lazio, as well as what are now the Po Valley, Emilia-Romagna, south-eastern Lombardy, southern Veneto and western Campania.

A large body of literature has flourished on the origins of the Etruscans, but the consensus among modern scholars is that the Etruscans were an indigenous population. The earliest evidence of a culture that is identifiably Etruscan dates from about 900 BC. This is the period of the Iron Age Villanovan culture, considered to be the earliest phase of Etruscan civilization, which itself developed from the previous late Bronze Age Proto-Villanovan culture in the same region, part of the central European Urnfield culture system. Etruscan civilization dominated Italy until it fell to the expanding Rome beginning in the late 4th century BC as a result of the Roman–Etruscan Wars; Etruscans were granted Roman citizenship in 90 BC and in 27 BC the whole Etruscan territory was incorporated into the newly established Roman Empire.