Composed the Ashtadhyayi: a complete generative grammar of Sanskrit in about four thousand ordered rules, with meta-rules governing how rules apply and how conflicts between them are settled.
Ashtadhyayi
Mid-first millennium BCE · range · disputed
Scholarly estimates differ by centuries; no date is settled
Shalatura, Gandhara · Gandhara — the north-west of the subcontinent (traditional)
Languages and grammar · CBSE · ICSE · IGCSE · IB · State — Vyakarana, Nirukta (etymology), Shiksha (phonetics). Phonetics and articulation, morphology, derivation, syntax and semantics — a complete descriptive grammar of a living language.
Linguistics and computational linguistics — Vyakarana, Shiksha, Nirukta. Generative rules, morphology and derivation, phonology, semantics, and the meta-rules that order rule application.
Evidence: traditionally attributed · no modern scholarly reference recorded yet.