Acharya Vamana
Acharya Vamana (latter half of the 8th century - early 9th century) was an Indian Rhetorician. Vamana's investigation into the nature of a Kāvya is known as theory of Riti. Vamana's Kavyalankara Sutra is considered as the first attempt at evolving a philosophy of literary aesthetics. He regarded that riti is the soul of Kavya. He presented his formulations in the form of Sutras. 