The Mahābhāshya was commented on in the seventh century by Bhartṛihari in his Vākyapadīya which is concerned with the philosophy of grammar, and by Kaiyaṭa (probably thirteenth century). About 650 A. D. was composed the first complete commentary on Pāṇini, the Kāçikā Vṛitti or "Benares Commentary," by Jayāditya and Vāmana.