Kāśikāvṛttī  (7th century) • Bhaṭṭi (c. 7th c. CE) exemplified Pāṇini's rules in his courtly epic the Bhaṭṭikāvya [2] . • The Buddhist school, including Nagarjuna (logic/philosophy, c. 150 CE) Dignaga (semantics and logic, c. 5th c. CE), Dharmakirti . Medieval accounts The earliest external historical accounts of Indian grammatical tradition