Cyrus the Great Founds the Persian Empire
A Median vassal builds the ancient world's first great multicultural empire
Quick facts
- Empire founded
- c. 550 BCE
- First capital
- Pasargadae
- Fell to
- Alexander the Great, 330 BCE
- Later revival
- Sasanian Empire, 224-651 CE
What happened
Cyrus II, later called Cyrus the Great, united the Persian tribes and overthrew the ruling Medes around 550 BCE, taking the title Shah of Persia and building a capital at Pasargadae. Rather than simply absorbing the many peoples he conquered, Cyrus treated his new territories as a kind of contract between himself and the various peoples in his care, a policy that let a sprawling empire of countless different peoples hold together under a single crown. His successors, the Achaemenid dynasty, expanded this empire across the Near East before losing it to Alexander the Great in 330 BCE, and it was later revived in a different form by the Sasanian Empire from 224 to 651 CE. That longer story, from Cyrus through Darius, the Greco-Persian Wars, and the Sasanians, has its own dedicated timeline.
Why it matters
Historians describe Cyrus's Persia as the first real empire: an empire built on an organizational structure developed from a realistic idea of how to govern different subject peoples, rather than on raw domination alone. That model defined the role of an emperor and set a template later empires from Rome to Britain would draw on. This timeline picks up the story of Iran where the Achaemenid and Sasanian empires end, at the Arab conquest of 651 CE; readers wanting the full arc of ancient Persia should see the dedicated Ancient Persia timeline.
How we know
Cyrus's rise and administrative approach are documented in Achaemenid-era inscriptions including the Cyrus Cylinder, cross-checked against Greek historians of the following century and confirmed by archaeological remains at Pasargadae.
Sources
- World History Encyclopedia. Achaemenid Empire · Reputable sourceworldhistory.org · The domain "worldhistory.org" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
- World History Encyclopedia. Achaemenid Empire · Reputable sourceworldhistory.org · The domain "worldhistory.org" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
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Related timelines
- Ancient Persia → · The full story of Cyrus, Darius, the Achaemenid and Sasanian empires, and Persia's wars with Greece and Rome has its own dedicated timeline.