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571 BCE

This year falls in the Iron Age (c. 1200–500 BCE). Iron tools and weapons spread, and new powers rise, among them Assyria, Babylon, the Zhou dynasty in China and the Greek city-states. Alphabets and coined money spread, and the Persian Empire is founded in the sixth century BCE.

Within fifteen years

Philosopher · Iron Age · GreecePythagorasc. 570–c. 495 BCGreek thinker born on Samos who settled at Croton in southern Italy and founded a religious brotherhood. His followers taught that number is the nature of all things. He wrote nothing himself, and lived about 570 to 495 BC.

Philosopher · Iron Age · NepalThe Buddhac. 563–c. 483 BC (traditional)Siddhartha Gautama, the awakened one, whose teaching on suffering and its end founded Buddhism, one of the world's great philosophical and religious traditions. Tradition dates him about 563 to 483 BC; some scholars place him about a century later.

Ruler · Iron Age · IranCyrus the Greatr. 559–530 BCFounder of the Persian Empire, ruling from 559 to 530 BC. He overthrew the Medes, took Lydia and its king Croesus, and captured Babylon in 539 BC without a siege. His empire ran from the Aegean to Central Asia, the largest the world had yet seen.