Who were the king’s eyes and ears in the Achaemenid Empire?

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Darius the Great — Darius I This chromolithograph of a frieze at Susa depicts attendants serving Darius I.

In the Achaemenid Empire, the officials known as the "king’s eyes" or the "king’s ears" were representatives sent from the central government to travel throughout the provinces. These individuals served as a vital administrative tool for the emperor, as they were tasked with investigating local conditions and reporting their findings directly back to the king to help him maintain control over the empire's vast territories.1