The earliest known inscriptions in Sanskrit date to the first century BCE.[citation needed] They are in the Brahmi script, which was originally used for Prakrit, not Sanskrit. It has been described as a paradox that the first evidence of written Sanskrit occurs centuries later than that of the Prakrit languages which are its linguistic descendants. In northern India, there are Brāhmī inscriptions dating from the third century BCE onwards, the oldest appearing on the famous Prakrit pillar inscriptions of king Ashoka. The earliest South Indian inscriptions in Tamil Brahmi, written in early Tamil, belong to the same period. When Sanskrit was written down, it was first used for texts of an administrative, literary or scientific nature. The sacred texts were preserved orally, and were set down in writing "reluctantly" (according to one commentator), and at a comparatively late date.
What king's pillar is the most recent Brahmi inscription found on? (If the question is unanswerable, say "unanswerable")
unanswerable