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Old Persian is an ancient Iranian language known from inscriptions dating back to the 6th and 5th centuries BCE. It is an extinct West Iranian language that was used in southwestern Iran. The language is known primarily through the official inscriptions of the Achaemenid rulers, such as Darius I and Xerxes I.123

The grammatical system of Old Persian shows a simplified version of the Indo-European inflectional system. For instance, some cases merged, and plural forms for nominative and accusative were not distinguished. Old Persian was written in a simplified, quasi-alphabetic cuneiform script. This language was continued by various forms of Middle Persian.432

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