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What information did the gold and silver foundation plates of Darius I record?
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Persepolis
Ruins of the royal Achaemenid residence at Persepolis, Iran.
In 1933, two sets of gold and silver foundation plates were discovered in the foundations of the audience hall (apadana) of Darius I at Persepolis. These plates recorded the boundaries of the Achaemenid Empire in three forms of cuneiform: Old Persian, Elamite, and Babylonian.1