Commenting on Ānandavardhana's Dhvanyaloka, P.V. Kane writes that "the Dhvanyāloka is an epoch-making work in the history of Alaṅkāra literature. It occupies the same position in poetics as Pāṇini's Aṣtādhyāyī in grammar and Śaṅkarācarya's commentary on Vedānta". https://en.wikipedia.org/wiki/Anandavardhana#cite_note-3