Episode Details

The Empire That Shook the World

To understand the Immortals, you first have to understand the world they were born into. The Achaemenid Persian Empire, which stretched from roughly 550 BCE to 330 BCE, was not merely a nation. It was the largest empire the ancient world had ever seen. At its height under Darius the Great and later Xerxes, it covered over two million square miles, stretching from the Indus Valley in modern-day Pakistan all the way west to the edges of Greece and north into Central Asia.

This empire managed dozens of different peoples, languages, and cultures under a single unified system of governance. The Persian kings were not simply warriors — they were administrators, diplomats, and visionaries. They built roads, they developed one of the earliest postal systems in history, and they created a military structure that was the envy of every rival power. At the core of that military structure was a single, legendary unit.

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