Nagari script - AbsoluteAstronomy.com

The Nāgarī script is the ancestor of Devanagari, Assamese, Bengali and other variants, and was first used to write Prakrit

Prakrit

Prakrit is the name for a group of Middle Indic, Indo-Aryan languages, derived from Old Indic dialects. The word itself has a flexible definition, being defined sometimes as, "original, natural, artless, normal, ordinary, usual", or "vernacular", in contrast to the literary and religious...

and Sanskrit

Sanskrit

Sanskrit , is a historical Indo-Aryan language and the primary liturgical language of Hinduism, Jainism and Buddhism.Buddhism: besides Pali, see Buddhist Hybrid Sanskrit Today, it is listed as one of the 22 scheduled languages of India and is an official language of the state of Uttarakhand...

. It was in vogue from before the 10th century