Persian Immortals Timeline

The Corps of the Ten Thousand Immortals is formed during the reign of Cyrus the Great of Persia.

The Immortals serve under the reign of Darius I The Great of Persia.

The Immortals serve under the reign of Xerxes I of Persia; notably in his 480 BCE invasion of Greece.

The Immortals continue to serve under the reign of Darius III of Persia.

Alexander the Great continues the tradition of the 10,000 Immortals.

The corps of Immortals are revived as a cavalry unit during the reign of Ardashir I after he founds the Sassanian Empire.

The Immortals serve as heavy cavalry of the Sassanian Empire.