>> Europe - Classical antiquity

Ancient Greece was the founding culture of Western civilisation. Western democratic and individualistic culture are often attributed to Ancient Greece. The Greeks city-state, the polis, was the fundamental political unit of classical Greece. In 508 BC, Cleisthenes instituted the world's first democratic system of government in Athens. The Greek political ideals were rediscovered in the late 18th century by European philosophers and idealists. Greece also generated many cultural contributions: in philosophy, humanism and rationalism under Aristotle, Socrates and Plato; in history with Herodotus and Thucydides; in dramatic and narrative verse, starting with the epic poems of Homer; in drama with Sophocles and Euripides, in medicine with Hippocrates and Galen; and in science with Pythagoras, Euclid and Archimedes. In the course of the 5th century BC, several of the Greek city states would ultimately check the Achaemenid Persian advance in Europe through the Greco-Persian Wars, considered a pivotal moment in world history, as the 50 years of peace that followed are known as Golden Age of Athens, the seminal period of ancient Greece that laid many of the foundations of Western civilization.

The Parthenon in Athens (432 BC)

Greece was followed by Rome, which left its mark on law, politics, language, engineering, architecture, government and many more key aspects in western civilisation. Expanding from their base in Italy beginning in the 3rd century BC, the Romans gradually expanded to eventually rule the entire Mediterranean basin and western Europe by the turn of the millennium. The Roman Republic ended in 27 BC, when Augustus proclaimed the Roman Empire. The two centuries that followed are known as the pax romana, a period of unprecedented peace, prosperity, and political stability in most of Europe.

The empire continued to expand under emperors such as Hadrian, Antoninus Pius, and Marcus Aurelius, who all spent time on the Empire's northern border fighting Germanic, Pictish and Scottish tribes. The Empire began to decline in the 3rd century, particularly in the west. Christianity was legalised by Constantine I in 313 AD after three centuries of imperial persecution. Constantine also permanently moved the capital of the empire from Rome to the city of Byzantium, which was renamed Constantinople in his honour (modern-day Istanbul) in 330 AD. Christianity became the sole official religion of the empire in 380 AD, and in 391-392 AD, the emperor Theodosius outlawed pagan religions. This is sometimes considered to mark the end of antiquity; alternatively antiquity is considered to end with the fall of the Western Roman Empire in 476 AD; the closure of the pagan Platonic Academy of Athens in 529 AD; or the rise of Islam in the early 7th century AD.
(source)