Possible parallels to dravidian -indo european interactions - Can Achaemenid adoption of elamite as administrative language be studied to understand if similar mechanism was in play during early contact of vedic Sanskrit with dravidian speakers

https://en.wikipedia.org/wiki/Persepolis\_Administrative\_Archives#:\~:text=The%20Persepolis%20Administrative%20Archive%20(also,to%20the%20Achaemenid%20Persian%20Empire.