section_path: History/Classical antiquity
section_name: Classical antiquity
paragraph_text: Classical antiquity
  
  Ancient Greece was the founding culture of Western civilisation. Western democratic and rationalist culture are often attributed to Ancient Greece. The Greek city-state, the polis, was the fundamental political unit of classical Greece. In 508 BCE, 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 BCE, 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 civilisation.
  
  Greece was followed by Rome, which left its mark on law, politics, language, engineering, architecture, government, and many more key aspects in western civilisation. By 200 BCE, Rome had conquered Italy and over the following two centuries it conquered Greece, Hispania (Spain and Portugal), the North African coast, much of the Middle East, Gaul (France and Belgium), and Britannia (England and Wales).
  
  Expanding from their base in central Italy beginning in the third century BCE, 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 BCE, 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 Antoninus Pius and Marcus Aurelius, who spent time on the Empire's northern border fighting Germanic, Pictish and Scottish tribes. Christianity was legalised by Constantine I in 313 CE after three centuries of imperial persecution. Constantine also permanently moved the capital of the empire from Rome to the city of Byzantium (modern-day Istanbul) which was renamed Constantinople in his honour in 330 CE. Christianity became the sole official religion of the empire in 380 CE, and in 391–392 CE 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 CE; the closure of the pagan Platonic Academy of Athens in 529 CE; or the rise of Islam in the early 7th century CE. During most of its existence, the Byzantine Empire was one of the most powerful economic, cultural, and military forces in Europe.