This is a letter written in Tamil to the Dutch East India Company in the 16th / 17th centuries by the Sultan of Penang on the east coast of present-day Malaysia.
The letter is currently kept at the National Museum of the Netherlands.
The Tamil language was the common language of commerce and trade in Southeast Asia for hundreds of years and only changed a few centuries ago.
Also see Galle Trilingual stone inscriptions dated 15 February 1409 by Chinese Admiral Zheng He.