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Also alongside the above, the ancient Iranians spoke Avestan, perhaps the Mother tongue of IndoEuropean Language (the Sacred Manthras of Zoroastrianism are still spoken/sung in Ancient Avestan today).
Avestan utilized the "Sumerian" cuneiform writing (as seen on the Cyrus Cylinder - the First declaration of Human Rights) in the same way Modern Persian utilizes Arabic letters while retaining the native IndoEuropean Language.