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550 BCE - 330 BCE: The Corps of the Ten Thousand Immortals is formed during the reign of Cyrus the Great of Persia.
522 BCE - 486 BCE: The Immortals serve under the reign of Darius I The Great of Persia.
486 BCE - 465 BCE: The Immortals serve under the reign of Xerxes I of Persia; notably in his 480 BCE invasion of Greece.
336 BCE - 330 BCE: The Immortals continue to serve under the reign of Darius III of Persia.
330 BCE - 323 BCE: Alexander the Great continues the tradition of the 10,000 Immortals.
224 CE - 240 CE: The corps of Immortals are revived as a cavalry unit during the reign of Ardashir I after he founds the Sassanian Empire.
224 CE - 651 CE: The Immortals serve as heavy cavalry of the Sassanian Empire.